diff --git a/centaur/src/main/resources/standardTestCases/drs_tests/wf_level_file_size.wdl b/centaur/src/main/resources/standardTestCases/drs_tests/wf_level_file_size.wdl
index 56d89094921..dc84d2e346b 100644
--- a/centaur/src/main/resources/standardTestCases/drs_tests/wf_level_file_size.wdl
+++ b/centaur/src/main/resources/standardTestCases/drs_tests/wf_level_file_size.wdl
@@ -1,8 +1,8 @@
 version 1.0
 
 workflow wf_level_file_size {
-    File input1 = "dos://wb-mock-drs-dev.storage.googleapis.com/4a3908ad-1f0b-4e2a-8a92-611f2123e8b0"
-    File input2 = "dos://wb-mock-drs-dev.storage.googleapis.com/0c8e7bc6-fd76-459d-947b-808b0605beb3"
+    File input1 = "drs://wb-mock-drs-dev.storage.googleapis.com/4a3908ad-1f0b-4e2a-8a92-611f2123e8b0"
+    File input2 = "drs://wb-mock-drs-dev.storage.googleapis.com/0c8e7bc6-fd76-459d-947b-808b0605beb3"
 
     output {
         Float fileSize1 = size(input1)
diff --git a/centaur/src/main/resources/standardTestCases/drs_usa_hca/drs_usa_hca.inputs b/centaur/src/main/resources/standardTestCases/drs_usa_hca/drs_usa_hca.inputs
index f528e7d2364..f82844519f9 100644
--- a/centaur/src/main/resources/standardTestCases/drs_usa_hca/drs_usa_hca.inputs
+++ b/centaur/src/main/resources/standardTestCases/drs_usa_hca/drs_usa_hca.inputs
@@ -1,8 +1,8 @@
 {
     # For all below 5 HCA uuids, Martha does not return a service account
-    "drs_usa_hca.localize_drs_with_usa.file1": "dos://service.staging.explore.data.humancellatlas.org/033c9840-c5cd-438b-b0e4-8e4cd8fc8dc6?version=2019-07-04T104122.106166Z",
-    "drs_usa_hca.localize_drs_with_usa.file2": "dos://service.staging.explore.data.humancellatlas.org/4defa7b0-46c2-4053-8e99-b827eed1bc96?version=2019-07-04T104122.100969Z",
-    "drs_usa_hca.localize_drs_with_usa.file3": "dos://service.staging.explore.data.humancellatlas.org/de5dcfc1-5aea-41ba-a7ae-e72c416cb450?version=2019-07-04T104122.092788Z",
-    "drs_usa_hca.localize_drs_with_usa.file4": "dos://service.staging.explore.data.humancellatlas.org/16dea2c5-e2bd-45bc-b2fd-fcac0daafc48?version=2019-07-04T104122.060634Z",
-    "drs_usa_hca.localize_drs_with_usa.file5": "dos://service.dev.explore.data.humancellatlas.org/7c800467-9143-402f-b965-4e7cad75c1e6?version=2019-05-26T130511.722646Z"
+    "drs_usa_hca.localize_drs_with_usa.file1": "drs://service.staging.explore.data.humancellatlas.org/033c9840-c5cd-438b-b0e4-8e4cd8fc8dc6?version=2019-07-04T104122.106166Z",
+    "drs_usa_hca.localize_drs_with_usa.file2": "drs://service.staging.explore.data.humancellatlas.org/4defa7b0-46c2-4053-8e99-b827eed1bc96?version=2019-07-04T104122.100969Z",
+    "drs_usa_hca.localize_drs_with_usa.file3": "drs://service.staging.explore.data.humancellatlas.org/de5dcfc1-5aea-41ba-a7ae-e72c416cb450?version=2019-07-04T104122.092788Z",
+    "drs_usa_hca.localize_drs_with_usa.file4": "drs://service.staging.explore.data.humancellatlas.org/16dea2c5-e2bd-45bc-b2fd-fcac0daafc48?version=2019-07-04T104122.060634Z",
+    "drs_usa_hca.localize_drs_with_usa.file5": "drs://service.dev.explore.data.humancellatlas.org/7c800467-9143-402f-b965-4e7cad75c1e6?version=2019-05-26T130511.722646Z"
 }
diff --git a/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsCloudNioFileSystemProvider.scala b/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsCloudNioFileSystemProvider.scala
index 1daf2da9893..2f36374212a 100644
--- a/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsCloudNioFileSystemProvider.scala
+++ b/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsCloudNioFileSystemProvider.scala
@@ -33,13 +33,13 @@ class DrsCloudNioFileSystemProvider(rootConfig: Config,
 
   override def isTransient(exception: Exception): Boolean = false
 
-  override def getScheme: String = "dos"
+  override def getScheme: String = "drs"
 
   override def getHost(uriAsString: String): String = {
     require(uriAsString.startsWith(s"$getScheme://"), s"Scheme does not match $getScheme")
 
     /*
-     * In some cases for a URI, the host name is null. For example, for DRS urls like 'dos://dg.123/123-123-123',
+     * In some cases for a URI, the host name is null. For example, for DRS urls like 'drs://dg.123/123-123-123',
      * even though 'dg.123' is a valid host, somehow since it does not conform to URI's standards, uri.getHost returns null. In such
      * cases, authority is used instead of host. If there is no authority, use an empty string.
      */
diff --git a/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsCloudNioRegularFileAttributes.scala b/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsCloudNioRegularFileAttributes.scala
index d4fe08e4655..1a9ec260059 100644
--- a/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsCloudNioRegularFileAttributes.scala
+++ b/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsCloudNioRegularFileAttributes.scala
@@ -24,7 +24,7 @@ class DrsCloudNioRegularFileAttributes(drsPath: String, drsPathResolver: DrsPath
 
   override def fileHash: Option[String] = {
     drsPathResolver.resolveDrsThroughMartha(drsPath).map(marthaResponse => {
-      marthaResponse.dos.data_object.checksums.flatMap {
+      marthaResponse.drs.data_object.checksums.flatMap {
         _.collectFirst{ case c if c.`type`.equalsIgnoreCase("md5") => c.checksum }
       }
     }).unsafeRunSync()
@@ -34,7 +34,7 @@ class DrsCloudNioRegularFileAttributes(drsPath: String, drsPathResolver: DrsPath
   override def lastModifiedTime(): FileTime = {
     val lastModifiedIO = for {
       marthaResponse <- drsPathResolver.resolveDrsThroughMartha(drsPath)
-      lastModifiedInString <- IO.fromEither(marthaResponse.dos.data_object.updated.toRight(throwRuntimeException("updated")))
+      lastModifiedInString <- IO.fromEither(marthaResponse.drs.data_object.updated.toRight(throwRuntimeException("updated")))
       lastModified <- convertToFileTime(lastModifiedInString)
     } yield lastModified
 
@@ -45,7 +45,7 @@ class DrsCloudNioRegularFileAttributes(drsPath: String, drsPathResolver: DrsPath
   override def size(): Long = {
     val sizeIO = for {
       marthaResponse <- drsPathResolver.resolveDrsThroughMartha(drsPath)
-      size <- IO.fromEither(marthaResponse.dos.data_object.size.toRight(throwRuntimeException("size")))
+      size <- IO.fromEither(marthaResponse.drs.data_object.size.toRight(throwRuntimeException("size")))
     } yield size
 
     sizeIO.unsafeRunSync()
diff --git a/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsPathResolver.scala b/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsPathResolver.scala
index cc8bbf7dd26..3adaed3152e 100644
--- a/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsPathResolver.scala
+++ b/cloud-nio/cloud-nio-impl-drs/src/main/scala/cloud/nio/impl/drs/DrsPathResolver.scala
@@ -19,10 +19,14 @@ case class DrsPathResolver(drsConfig: DrsConfig, httpClientBuilder: HttpClientBu
 
   implicit lazy val urlDecoder: Decoder[Url] = deriveDecoder
   implicit lazy val checksumDecoder: Decoder[ChecksumObject] = deriveDecoder
-  implicit lazy val dataObjectDecoder: Decoder[DosDataObject] = deriveDecoder
-  implicit lazy val dosObjectDecoder: Decoder[DosObject] = deriveDecoder
+  implicit lazy val dataObjectDecoder: Decoder[DrsDataObject] = deriveDecoder
+  implicit lazy val drsObjectDecoder: Decoder[DrsObject] = deriveDecoder
   implicit lazy val saDataObjectDecoder: Decoder[SADataObject] = deriveDecoder
-  implicit lazy val marthaResponseDecoder: Decoder[MarthaResponse] = deriveDecoder
+  // Martha is still returning objects keyed by the obsolete "dos" terminology rather than the current term "drs".
+  // In order to avoid having Cromwell's case classes use the obsolete terminology that would arise from a derived
+  // decoder, this `forProduct2` construct instructs Circe to take the value keyed by `dos` and pass that as the
+  // first argument to `MarthaResponse.apply`, which happens to be the constructor parameter formally named `drs`.
+  implicit lazy val marthaResponseDecoder: Decoder[MarthaResponse] = Decoder.forProduct2("dos", "googleServiceAccount")(MarthaResponse.apply)
 
   private val DrsPathToken = "${drsPath}"
 
@@ -48,7 +52,7 @@ case class DrsPathResolver(drsConfig: DrsConfig, httpClientBuilder: HttpClientBu
       e => IO.raiseError(new RuntimeException(s"Failed to parse response from Martha into a case class. Error: ${ExceptionUtils.getMessage(e)}"))
     }
   }
-  
+
   private def executeMarthaRequest(httpPost: HttpPost): Resource[IO, HttpResponse]= {
     for {
       httpClient <- Resource.fromAutoCloseable(IO(httpClientBuilder.build()))
@@ -78,13 +82,13 @@ case class Url(url: String)
 
 case class ChecksumObject(checksum: String, `type`: String)
 
-case class DosDataObject(size: Option[Long],
+case class DrsDataObject(size: Option[Long],
                          checksums: Option[Array[ChecksumObject]],
                          updated: Option[String],
                          urls: Array[Url])
 
-case class DosObject(data_object: DosDataObject)
+case class DrsObject(data_object: DrsDataObject)
 
 case class SADataObject(data: Json)
 
-case class MarthaResponse(dos: DosObject, googleServiceAccount: Option[SADataObject])
+case class MarthaResponse(drs: DrsObject, googleServiceAccount: Option[SADataObject])
diff --git a/cromwell-drs-localizer/src/main/scala/drs/localizer/DrsLocalizerMain.scala b/cromwell-drs-localizer/src/main/scala/drs/localizer/DrsLocalizerMain.scala
index 450532cf6a9..f52b8e5d562 100644
--- a/cromwell-drs-localizer/src/main/scala/drs/localizer/DrsLocalizerMain.scala
+++ b/cromwell-drs-localizer/src/main/scala/drs/localizer/DrsLocalizerMain.scala
@@ -61,7 +61,7 @@ object DrsLocalizerMain extends IOApp {
       marthaResponse <- resolveDrsThroughMartha(drsUrl, marthaUri)
       _ = httpBackendConnection.close()
       // Currently Martha only supports resolving DRS paths to GCS paths
-      gcsUrl <- extractFirstGcsUrl(marthaResponse.dos.data_object.urls)
+      gcsUrl <- extractFirstGcsUrl(marthaResponse.drs.data_object.urls)
       exitState <- downloadFileFromGcs(gcsUrl, marthaResponse.googleServiceAccount.map(_.data.toString), downloadLoc, requesterPaysId)
     } yield exitState
 
diff --git a/cromwell-drs-localizer/src/main/scala/drs/localizer/MarthaResponse.scala b/cromwell-drs-localizer/src/main/scala/drs/localizer/MarthaResponse.scala
index 3d907978e5f..be172bae181 100644
--- a/cromwell-drs-localizer/src/main/scala/drs/localizer/MarthaResponse.scala
+++ b/cromwell-drs-localizer/src/main/scala/drs/localizer/MarthaResponse.scala
@@ -6,10 +6,14 @@ import io.circe.generic.semiauto.deriveDecoder
 
 object MarthaResponseJsonSupport {
   implicit val urlFormat: Decoder[Url] = deriveDecoder
-  implicit val dataObject: Decoder[DosDataObject] = deriveDecoder
-  implicit val dosObjectFormat: Decoder[DosObject] = deriveDecoder
+  implicit val dataObject: Decoder[DrsDataObject] = deriveDecoder
+  implicit val drsObjectFormat: Decoder[DrsObject] = deriveDecoder
   implicit val googleServiceAccountFormat: Decoder[GoogleServiceAccount] = deriveDecoder
-  implicit val marthaResponseFormat: Decoder[MarthaResponse] = deriveDecoder
+  // Martha is still returning objects keyed by the obsolete "dos" terminology rather than the current term "drs".
+  // In order to avoid having Cromwell's case classes use the obsolete terminology that would arise from a derived
+  // decoder, this `forProduct2` construct instructs Circe to take the value keyed by `dos` and pass that as the
+  // first argument to `MarthaResponse.apply`, which happens to be the constructor parameter formally named `drs`.
+  implicit val marthaResponseFormat: Decoder[MarthaResponse] = Decoder.forProduct2("dos", "googleServiceAccount")(MarthaResponse.apply)
 
   implicit val samErrorResponseFormat: Decoder[SamErrorResponse] = deriveDecoder
   implicit val samErrorResponseCodeFormat: Decoder[SamErrorResponseCode] = deriveDecoder
@@ -17,10 +21,10 @@ object MarthaResponseJsonSupport {
 }
 
 case class Url(url: String)
-case class DosDataObject(urls: Array[Url])
-case class DosObject(data_object: DosDataObject)
+case class DrsDataObject(urls: Array[Url])
+case class DrsObject(data_object: DrsDataObject)
 case class GoogleServiceAccount(data: Json)
-case class MarthaResponse(dos: DosObject, googleServiceAccount: Option[GoogleServiceAccount])
+case class MarthaResponse(drs: DrsObject, googleServiceAccount: Option[GoogleServiceAccount])
 
 
 case class SamErrorResponse(text: String)
diff --git a/filesystems/drs/src/main/scala/cromwell/filesystems/drs/DrsPathBuilderFactory.scala b/filesystems/drs/src/main/scala/cromwell/filesystems/drs/DrsPathBuilderFactory.scala
index 7d9cbbaeffa..4f93e3ec7c3 100644
--- a/filesystems/drs/src/main/scala/cromwell/filesystems/drs/DrsPathBuilderFactory.scala
+++ b/filesystems/drs/src/main/scala/cromwell/filesystems/drs/DrsPathBuilderFactory.scala
@@ -87,7 +87,7 @@ class DrsPathBuilderFactory(globalConfig: Config, instanceConfig: Config, single
     for {
       serviceAccountJson <- serviceAccountJsonIo
       //Currently, Martha only supports resolving DRS paths to GCS paths
-      url <- IO.fromEither(DrsResolver.extractUrlForScheme(marthaResponse.dos.data_object.urls, GcsScheme))
+      url <- IO.fromEither(DrsResolver.extractUrlForScheme(marthaResponse.drs.data_object.urls, GcsScheme))
       readableByteChannel <- inputReadChannel(url, GcsScheme, serviceAccountJson, requesterPaysProjectIdOption)
     } yield readableByteChannel
   }
diff --git a/filesystems/drs/src/main/scala/cromwell/filesystems/drs/DrsResolver.scala b/filesystems/drs/src/main/scala/cromwell/filesystems/drs/DrsResolver.scala
index 875bb106998..f84cfc1eb90 100644
--- a/filesystems/drs/src/main/scala/cromwell/filesystems/drs/DrsResolver.scala
+++ b/filesystems/drs/src/main/scala/cromwell/filesystems/drs/DrsResolver.scala
@@ -31,7 +31,7 @@ object DrsResolver {
       drsFileSystemProvider <- toIO(drsFileSystemProviderOption, noFileSystemForDrsError)
       marthaResponse <- drsFileSystemProvider.drsPathResolver.resolveDrsThroughMartha(drsPath.pathAsString)
       //Currently, Martha only supports resolving DRS paths to GCS paths
-      relativePath <- IO.fromEither(extractUrlForScheme(marthaResponse.dos.data_object.urls, GcsScheme))
+      relativePath <- IO.fromEither(extractUrlForScheme(marthaResponse.drs.data_object.urls, GcsScheme))
         .map(_.substring(urlProtocolLength(GcsScheme)))
         .handleErrorWith(e => IO.raiseError(new RuntimeException(s"Error while resolving DRS path: $drsPath. Error: ${ExceptionUtils.getMessage(e)}")))
     } yield relativePath
diff --git a/filesystems/drs/src/test/scala/cromwell/filesystems/drs/DrsPathBuilderSpec.scala b/filesystems/drs/src/test/scala/cromwell/filesystems/drs/DrsPathBuilderSpec.scala
index ae8cfa442c1..ee93ff45581 100644
--- a/filesystems/drs/src/test/scala/cromwell/filesystems/drs/DrsPathBuilderSpec.scala
+++ b/filesystems/drs/src/test/scala/cromwell/filesystems/drs/DrsPathBuilderSpec.scala
@@ -28,12 +28,12 @@ class DrsPathBuilderSpec extends TestKitSuite with FlatSpecLike with Matchers wi
 
   private def pathsToTruncate = Table(
     ("context", "file", "relative"),
-    ("dos://bucket/path/to/my/dir", "dos://bucket/path/to/my/dir/file", "file"),
-    ("dos://bucket/path/to/my/dir", "dos://bucket/path/to/my/dir//file", "file"),
-    ("dos://bucket/path/to/my//dir", "dos://bucket/path/to/my/dir/file", "dir/file"),
-    ("dos://bucket/path/to/my//dir", "dos://bucket/path/to/my/dir//file", "dir//file"),
-    ("dos://bucket/path/to/my/dir", "dos://bucket/path/./to/my/dir/file", "./to/my/dir/file"),
-    ("dos://bucket/path/to/my/dir/with/file", "dos://bucket/path/to/other/dir/with/file", "other/dir/with/file")
+    ("drs://bucket/path/to/my/dir", "drs://bucket/path/to/my/dir/file", "file"),
+    ("drs://bucket/path/to/my/dir", "drs://bucket/path/to/my/dir//file", "file"),
+    ("drs://bucket/path/to/my//dir", "drs://bucket/path/to/my/dir/file", "dir/file"),
+    ("drs://bucket/path/to/my//dir", "drs://bucket/path/to/my/dir//file", "dir//file"),
+    ("drs://bucket/path/to/my/dir", "drs://bucket/path/./to/my/dir/file", "./to/my/dir/file"),
+    ("drs://bucket/path/to/my/dir/with/file", "drs://bucket/path/to/other/dir/with/file", "other/dir/with/file")
   )
 
   private def bucket = "mymadeupbucket"
@@ -41,71 +41,71 @@ class DrsPathBuilderSpec extends TestKitSuite with FlatSpecLike with Matchers wi
   private def goodPaths = Seq(
     GoodPath(
       description = "a path with spaces",
-      path = s"dos://$bucket/hello/world/with spaces",
+      path = s"drs://$bucket/hello/world/with spaces",
       normalize = false,
-      pathAsString = s"dos://$bucket/hello/world/with spaces",
+      pathAsString = s"drs://$bucket/hello/world/with spaces",
       pathWithoutScheme = s"$bucket/hello/world/with spaces",
-      parent = s"dos://$bucket/hello/world/",
-      getParent = s"dos://$bucket/hello/world/",
-      root = s"dos://$bucket/",
+      parent = s"drs://$bucket/hello/world/",
+      getParent = s"drs://$bucket/hello/world/",
+      root = s"drs://$bucket/",
       name = "with spaces",
-      getFileName = s"dos://$bucket/with spaces",
+      getFileName = s"drs://$bucket/with spaces",
       getNameCount = 3,
       isAbsolute = true),
 
     GoodPath(
       description = "a path with non-ascii",
-      path = s"dos://$bucket/hello/world/with non ascii £€",
+      path = s"drs://$bucket/hello/world/with non ascii £€",
       normalize = false,
-      pathAsString = s"dos://$bucket/hello/world/with non ascii £€",
+      pathAsString = s"drs://$bucket/hello/world/with non ascii £€",
       pathWithoutScheme = s"$bucket/hello/world/with non ascii £€",
-      parent = s"dos://$bucket/hello/world/",
-      getParent = s"dos://$bucket/hello/world/",
-      root = s"dos://$bucket/",
+      parent = s"drs://$bucket/hello/world/",
+      getParent = s"drs://$bucket/hello/world/",
+      root = s"drs://$bucket/",
       name = "with non ascii £€",
-      getFileName = s"dos://$bucket/with non ascii £€",
+      getFileName = s"drs://$bucket/with non ascii £€",
       getNameCount = 3,
       isAbsolute = true),
 
     GoodPath(
       description = "a gs uri path with encoded characters",
-      path = s"dos://$bucket/hello/world/encoded%20spaces",
+      path = s"drs://$bucket/hello/world/encoded%20spaces",
       normalize = false,
-      pathAsString = s"dos://$bucket/hello/world/encoded%20spaces",
+      pathAsString = s"drs://$bucket/hello/world/encoded%20spaces",
       pathWithoutScheme = s"$bucket/hello/world/encoded%20spaces",
-      parent = s"dos://$bucket/hello/world/",
-      getParent = s"dos://$bucket/hello/world/",
-      root = s"dos://$bucket/",
+      parent = s"drs://$bucket/hello/world/",
+      getParent = s"drs://$bucket/hello/world/",
+      root = s"drs://$bucket/",
       name = "encoded%20spaces",
-      getFileName = s"dos://$bucket/encoded%20spaces",
+      getFileName = s"drs://$bucket/encoded%20spaces",
       getNameCount = 3,
       isAbsolute = true),
 
     GoodPath(
       description = "a file at the top of the bucket",
-      path = s"dos://$bucket/hello",
+      path = s"drs://$bucket/hello",
       normalize = false,
-      pathAsString = s"dos://$bucket/hello",
+      pathAsString = s"drs://$bucket/hello",
       pathWithoutScheme = s"$bucket/hello",
-      parent = s"dos://$bucket/",
-      getParent = s"dos://$bucket/",
-      root = s"dos://$bucket/",
+      parent = s"drs://$bucket/",
+      getParent = s"drs://$bucket/",
+      root = s"drs://$bucket/",
       name = "hello",
-      getFileName = s"dos://$bucket/hello",
+      getFileName = s"drs://$bucket/hello",
       getNameCount = 1,
       isAbsolute = true),
 
     GoodPath(
       description = "a path ending in /",
-      path = s"dos://$bucket/hello/world/",
+      path = s"drs://$bucket/hello/world/",
       normalize = false,
-      pathAsString = s"dos://$bucket/hello/world",
+      pathAsString = s"drs://$bucket/hello/world",
       pathWithoutScheme = s"$bucket/hello/world",
-      parent = s"dos://$bucket/hello/",
-      getParent = s"dos://$bucket/hello/",
-      root = s"dos://$bucket/",
+      parent = s"drs://$bucket/hello/",
+      getParent = s"drs://$bucket/hello/",
+      root = s"drs://$bucket/",
       name = "world",
-      getFileName = s"dos://$bucket/world",
+      getFileName = s"drs://$bucket/world",
       getNameCount = 2,
       isAbsolute = true),
 
@@ -113,57 +113,57 @@ class DrsPathBuilderSpec extends TestKitSuite with FlatSpecLike with Matchers wi
 
     GoodPath(
       description = "a bucket with a path .",
-      path = s"dos://$bucket/.",
+      path = s"drs://$bucket/.",
       normalize = false,
-      pathAsString = s"dos://$bucket/.",
+      pathAsString = s"drs://$bucket/.",
       pathWithoutScheme = s"$bucket/.",
       parent = null,
-      getParent = s"dos://$bucket/",
-      root = s"dos://$bucket/",
+      getParent = s"drs://$bucket/",
+      root = s"drs://$bucket/",
       name = "",
-      getFileName = s"dos://$bucket/.",
+      getFileName = s"drs://$bucket/.",
       getNameCount = 1,
       isAbsolute = true),
 
     GoodPath(
       description = "a bucket with a path ..",
-      path = s"dos://$bucket/..",
+      path = s"drs://$bucket/..",
       normalize = false,
-      pathAsString = s"dos://$bucket/..",
+      pathAsString = s"drs://$bucket/..",
       pathWithoutScheme = s"$bucket/..",
       parent = null,
-      getParent = s"dos://$bucket/",
+      getParent = s"drs://$bucket/",
       root = null,
       name = "",
-      getFileName = s"dos://$bucket/..",
+      getFileName = s"drs://$bucket/..",
       getNameCount = 1,
       isAbsolute = true),
 
     GoodPath(
       description = "a bucket including . in the path",
-      path = s"dos://$bucket/hello/./world",
+      path = s"drs://$bucket/hello/./world",
       normalize = false,
-      pathAsString = s"dos://$bucket/hello/./world",
+      pathAsString = s"drs://$bucket/hello/./world",
       pathWithoutScheme = s"$bucket/hello/./world",
-      parent = s"dos://$bucket/hello/",
-      getParent = s"dos://$bucket/hello/./",
-      root = s"dos://$bucket/",
+      parent = s"drs://$bucket/hello/",
+      getParent = s"drs://$bucket/hello/./",
+      root = s"drs://$bucket/",
       name = "world",
-      getFileName = s"dos://$bucket/world",
+      getFileName = s"drs://$bucket/world",
       getNameCount = 3,
       isAbsolute = true),
 
     GoodPath(
       description = "a bucket including .. in the path",
-      path = s"dos://$bucket/hello/../world",
+      path = s"drs://$bucket/hello/../world",
       normalize = false,
-      pathAsString = s"dos://$bucket/hello/../world",
+      pathAsString = s"drs://$bucket/hello/../world",
       pathWithoutScheme = s"$bucket/hello/../world",
-      parent = s"dos://$bucket/",
-      getParent = s"dos://$bucket/hello/../",
-      root = s"dos://$bucket/",
+      parent = s"drs://$bucket/",
+      getParent = s"drs://$bucket/hello/../",
+      root = s"drs://$bucket/",
       name = "world",
-      getFileName = s"dos://$bucket/world",
+      getFileName = s"drs://$bucket/world",
       getNameCount = 3,
       isAbsolute = true),
 
@@ -171,13 +171,13 @@ class DrsPathBuilderSpec extends TestKitSuite with FlatSpecLike with Matchers wi
 
     GoodPath(
       description = "a bucket with a normalized path .",
-      path = s"dos://$bucket/.",
+      path = s"drs://$bucket/.",
       normalize = true,
-      pathAsString = s"dos://$bucket/",
+      pathAsString = s"drs://$bucket/",
       pathWithoutScheme = s"$bucket/",
       parent = null,
       getParent = null,
-      root = s"dos://$bucket/",
+      root = s"drs://$bucket/",
       name = "",
       getFileName = null,
       getNameCount = 0,
@@ -185,13 +185,13 @@ class DrsPathBuilderSpec extends TestKitSuite with FlatSpecLike with Matchers wi
 
     GoodPath(
       description = "a bucket with a normalized path ..",
-      path = s"dos://$bucket/..",
+      path = s"drs://$bucket/..",
       normalize = true,
-      pathAsString = s"dos://$bucket/",
+      pathAsString = s"drs://$bucket/",
       pathWithoutScheme = s"$bucket/",
       parent = null,
       getParent = null,
-      root = s"dos://$bucket/",
+      root = s"drs://$bucket/",
       name = "",
       getFileName = null,
       getNameCount = 1,
@@ -199,83 +199,83 @@ class DrsPathBuilderSpec extends TestKitSuite with FlatSpecLike with Matchers wi
 
     GoodPath(
       description = "a bucket including . in the normalized path",
-      path = s"dos://$bucket/hello/./world",
+      path = s"drs://$bucket/hello/./world",
       normalize = true,
-      pathAsString = s"dos://$bucket/hello/world",
+      pathAsString = s"drs://$bucket/hello/world",
       pathWithoutScheme = s"$bucket/hello/world",
-      parent = s"dos://$bucket/hello/",
-      getParent = s"dos://$bucket/hello/",
-      root = s"dos://$bucket/",
+      parent = s"drs://$bucket/hello/",
+      getParent = s"drs://$bucket/hello/",
+      root = s"drs://$bucket/",
       name = "world",
-      getFileName = s"dos://$bucket/world",
+      getFileName = s"drs://$bucket/world",
       getNameCount = 2,
       isAbsolute = true),
 
     GoodPath(
       description = "a bucket including .. in the normalized path",
-      path = s"dos://$bucket/hello/../world",
+      path = s"drs://$bucket/hello/../world",
       normalize = true,
-      pathAsString = s"dos://$bucket/world",
+      pathAsString = s"drs://$bucket/world",
       pathWithoutScheme = s"$bucket/world",
-      parent = s"dos://$bucket/",
-      getParent = s"dos://$bucket/",
-      root = s"dos://$bucket/",
+      parent = s"drs://$bucket/",
+      getParent = s"drs://$bucket/",
+      root = s"drs://$bucket/",
       name = "world",
-      getFileName = s"dos://$bucket/world",
+      getFileName = s"drs://$bucket/world",
       getNameCount = 1,
       isAbsolute = true),
 
     GoodPath(
       description = "a bucket with an underscore",
-      path = s"dos://hello_underscore/world",
+      path = s"drs://hello_underscore/world",
       normalize = true,
-      pathAsString = s"dos://hello_underscore/world",
+      pathAsString = s"drs://hello_underscore/world",
       pathWithoutScheme = s"hello_underscore/world",
-      parent = s"dos://hello_underscore/",
-      getParent = s"dos://hello_underscore/",
-      root = s"dos://hello_underscore/",
+      parent = s"drs://hello_underscore/",
+      getParent = s"drs://hello_underscore/",
+      root = s"drs://hello_underscore/",
       name = "world",
-      getFileName = s"dos://hello_underscore/world",
+      getFileName = s"drs://hello_underscore/world",
       getNameCount = 1,
       isAbsolute = true),
 
     GoodPath(
       description = "a bucket named .",
-      path = s"dos://./hello/world",
+      path = s"drs://./hello/world",
       normalize = true,
-      pathAsString = s"dos://./hello/world",
+      pathAsString = s"drs://./hello/world",
       pathWithoutScheme = s"./hello/world",
-      parent = s"dos://./hello/",
-      getParent = s"dos://./hello/",
-      root = s"dos://./",
+      parent = s"drs://./hello/",
+      getParent = s"drs://./hello/",
+      root = s"drs://./",
       name = "world",
-      getFileName = s"dos://./world",
+      getFileName = s"drs://./world",
       getNameCount = 2,
       isAbsolute = true),
 
     GoodPath(
       description = "a non ascii bucket name",
-      path = s"dos://nonasciibucket£€/hello/world",
+      path = s"drs://nonasciibucket£€/hello/world",
       normalize = true,
-      pathAsString = s"dos://nonasciibucket£€/hello/world",
+      pathAsString = s"drs://nonasciibucket£€/hello/world",
       pathWithoutScheme = s"nonasciibucket£€/hello/world",
-      parent = s"dos://nonasciibucket£€/hello/",
-      getParent = s"dos://nonasciibucket£€/hello/",
-      root = s"dos://nonasciibucket£€/",
+      parent = s"drs://nonasciibucket£€/hello/",
+      getParent = s"drs://nonasciibucket£€/hello/",
+      root = s"drs://nonasciibucket£€/",
       name = "world",
-      getFileName = s"dos://nonasciibucket£€/world",
+      getFileName = s"drs://nonasciibucket£€/world",
       getNameCount = 2,
       isAbsolute = true),
 
     GoodPath(
       description = "an non-absolute path without a host",
-      path = s"dos://blah/",
+      path = s"drs://blah/",
       normalize = false,
-      pathAsString = s"dos://blah/",
+      pathAsString = s"drs://blah/",
       pathWithoutScheme = s"blah/",
       parent = null,
       getParent = null,
-      root = s"dos://blah/",
+      root = s"drs://blah/",
       name = "",
       getFileName = null,
       getNameCount = 1,
@@ -283,13 +283,13 @@ class DrsPathBuilderSpec extends TestKitSuite with FlatSpecLike with Matchers wi
 
     GoodPath(
       description = "an absolute path without a host",
-      path = s"dos://blah",
+      path = s"drs://blah",
       normalize = false,
-      pathAsString = s"dos://blah/",
+      pathAsString = s"drs://blah/",
       pathWithoutScheme = s"blah/",
       parent = null,
       getParent = null,
-      root = s"dos://blah/",
+      root = s"drs://blah/",
       name = "",
       getFileName = null,
       getNameCount = 1,
@@ -297,13 +297,13 @@ class DrsPathBuilderSpec extends TestKitSuite with FlatSpecLike with Matchers wi
   )
 
   private def badPaths = Seq(
-    BadPath("an empty path", "", " does not have a dos scheme."),
-    BadPath("a GCS path", s"gs://$bucket/hello/world", "gs://mymadeupbucket/hello/world does not have a dos scheme."),
-    BadPath("an bucketless path", "dos://", "Expected authority at index 6: dos://"),
-    BadPath("a https path", "https://hello/world", "https://hello/world does not have a dos scheme."),
-    BadPath("a file uri path", "file:///hello/world", "file:///hello/world does not have a dos scheme."),
-    BadPath("a relative file path", "hello/world", "hello/world does not have a dos scheme."),
-    BadPath("an absolute file path", "/hello/world", "/hello/world does not have a dos scheme."),
+    BadPath("an empty path", "", " does not have a drs scheme."),
+    BadPath("a GCS path", s"gs://$bucket/hello/world", "gs://mymadeupbucket/hello/world does not have a drs scheme."),
+    BadPath("an bucketless path", "drs://", "Expected authority at index 6: drs://"),
+    BadPath("a https path", "https://hello/world", "https://hello/world does not have a drs scheme."),
+    BadPath("a file uri path", "file:///hello/world", "file:///hello/world does not have a drs scheme."),
+    BadPath("a relative file path", "hello/world", "hello/world does not have a drs scheme."),
+    BadPath("an absolute file path", "/hello/world", "/hello/world does not have a drs scheme."),
   )
 
   private def drsReadInterpreter(marthaResponse: MarthaResponse): IO[ReadableByteChannel] =
diff --git a/filesystems/drs/src/test/scala/cromwell/filesystems/drs/MockDrsPathResolver.scala b/filesystems/drs/src/test/scala/cromwell/filesystems/drs/MockDrsPathResolver.scala
index b52a576a9e4..a3e1b00c1b5 100644
--- a/filesystems/drs/src/test/scala/cromwell/filesystems/drs/MockDrsPathResolver.scala
+++ b/filesystems/drs/src/test/scala/cromwell/filesystems/drs/MockDrsPathResolver.scala
@@ -28,14 +28,14 @@ class MockDrsPathResolver(drsConfig: DrsConfig, httpClientBuilder: HttpClientBui
 
 
   private def createMarthaResponse(urlArray: Array[Url]): IO[MarthaResponse] =  {
-    val dosDataObject = DosDataObject(
+    val drsDataObject = DrsDataObject(
       size = Option(123),
       checksums = Option(Array(checksumObj)),
       updated = None,
       urls = urlArray
     )
 
-    IO(MarthaResponse(DosObject(dosDataObject), Option(SADataObject(Json.fromString("{}")))))
+    IO(MarthaResponse(DrsObject(drsDataObject), Option(SADataObject(Json.fromString("{}")))))
   }
 
   override def resolveDrsThroughMartha(drsPath: String, serviceAccount: Option[String]): IO[MarthaResponse] = {
@@ -62,7 +62,7 @@ class MockDrsCloudNioFileSystemProvider(config: Config,
 
 
 object MockDrsPaths {
-  private val drsPathPrefix = "dos://drs-host/"
+  private val drsPathPrefix = "drs://drs-host/"
 
   val drsPathResolvingToOneGcsPath = s"$drsPathPrefix/4d427aa3-5640-4f00-81ae-c33443f84acf"
 
diff --git a/supportedBackends/google/pipelines/v2alpha1/src/test/resources/reference.conf b/supportedBackends/google/pipelines/v2alpha1/src/test/resources/reference.conf
index 0d57f772594..dca01308ed6 100644
--- a/supportedBackends/google/pipelines/v2alpha1/src/test/resources/reference.conf
+++ b/supportedBackends/google/pipelines/v2alpha1/src/test/resources/reference.conf
@@ -1,2 +1,2 @@
-drs.localization.docker-image = "somerepo/dos-downloader:tagged"
+drs.localization.docker-image = "somerepo/drs-downloader:tagged"
 drs.localization.command-template = "/path/to/some_executable before args ${drsPath} middle args ${containerPath} ends args"
diff --git a/supportedBackends/google/pipelines/v2alpha1/src/test/scala/cromwell/backend/google/pipelines/v2alpha1/PipelinesConversionsSpec.scala b/supportedBackends/google/pipelines/v2alpha1/src/test/scala/cromwell/backend/google/pipelines/v2alpha1/PipelinesConversionsSpec.scala
index 1cbead8ed00..21ee3561d2c 100644
--- a/supportedBackends/google/pipelines/v2alpha1/src/test/scala/cromwell/backend/google/pipelines/v2alpha1/PipelinesConversionsSpec.scala
+++ b/supportedBackends/google/pipelines/v2alpha1/src/test/scala/cromwell/backend/google/pipelines/v2alpha1/PipelinesConversionsSpec.scala
@@ -44,7 +44,7 @@ class PipelinesConversionsSpec extends FlatSpec with Matchers {
       new DrsCloudNioFileSystemProvider(marthaConfig, fakeCredentials, httpClientBuilder, drsReadInterpreter),
       None,
     )
-    val drsPath = drsPathBuilder.build("dos://dos.example.org/aaaabbbb-cccc-dddd-eeee-abcd0000dcba").get
+    val drsPath = drsPathBuilder.build("drs://drs.example.org/aaaabbbb-cccc-dddd-eeee-abcd0000dcba").get
     val containerRelativePath = DefaultPathBuilder.get("path/to/file.bai")
     val mount = PipelinesApiWorkingDisk(DiskType.LOCAL, 1)
     val input = PipelinesApiFileInput("example", drsPath, containerRelativePath, mount)
@@ -59,7 +59,7 @@ class PipelinesConversionsSpec extends FlatSpec with Matchers {
     logging.get("commands") should be(a[java.util.List[_]])
     logging.get("commands").asInstanceOf[java.util.List[_]] should contain(
       """printf '%s %s\n' "$(date -u '+%Y/%m/%d %H:%M:%S')" """ +
-        """Localizing\ input\ dos://dos.example.org/aaaabbbb-cccc-dddd-eeee-abcd0000dcba\ """ +
+        """Localizing\ input\ drs://drs.example.org/aaaabbbb-cccc-dddd-eeee-abcd0000dcba\ """ +
         """-\>\ /cromwell_root/path/to/file.bai"""
     )
 
@@ -83,14 +83,14 @@ class PipelinesConversionsSpec extends FlatSpec with Matchers {
 
     action.get("commands") should be(a[java.util.List[_]])
     action.get("commands").asInstanceOf[java.util.List[_]] should contain theSameElementsAs List(
-      "dos://dos.example.org/aaaabbbb-cccc-dddd-eeee-abcd0000dcba",
+      "drs://drs.example.org/aaaabbbb-cccc-dddd-eeee-abcd0000dcba",
       "/cromwell_root/path/to/file.bai"
     )
 
     action.get("mounts") should be(a[java.util.List[_]])
     action.get("mounts").asInstanceOf[java.util.List[_]] should be (empty)
 
-    action.get("imageUri") should be("somerepo/dos-downloader:tagged")
+    action.get("imageUri") should be("somerepo/drs-downloader:tagged")
 
     val actionLabels = action.get("labels").asInstanceOf[java.util.Map[_, _]]
     actionLabels.keySet.asScala should contain theSameElementsAs List("tag", "inputName")