diff --git a/dev/ci/Jenkinsfile b/dev/ci/Jenkinsfile
index af508d63427..20c3e39a629 100644
--- a/dev/ci/Jenkinsfile
+++ b/dev/ci/Jenkinsfile
@@ -6,9 +6,9 @@ def HOMEgfs_dev = 'none'
 def CI_CASES = ''
 def GH = 'none'
 // Map of the machine names (MACHINE_ID) to the Jenkins Node names
-def NodeName = [hera: 'Hera-EMC', ursa: 'Ursa-EMC', orion: 'Orion-EMC', hercules: 'Hercules-EMC', gaeac5: 'GaeaC5', gaeac6: 'Gaeac6-EMC']
+def NodeName = [hera: 'Hera-EMC', ursa: 'Ursa-EMC', orion: 'Orion-EMC', hercules: 'Hercules-EMC', gaeac6: 'Gaeac6-EMC']
 // Location of the custom workspaces for each machine in the CI system.  They are persistent for each iteration of the PR.
-def custom_workspace = [hera: '/scratch3/NCEPDEV/global/role.glopara/CI/HERA', ursa: '/scratch3/NCEPDEV/global/role.glopara/CI/URSA', orion: '/work2/noaa/global/role-global/GFS_CI_CD/ORION/CI', hercules: '/work2/noaa/global/role-global/GFS_CI_CD/HERCULES/CI', gaeac5: '/gpfs/f5/epic/proj-shared/global/CI', gaeac6: '/gpfs/f6/drsa-precip3/world-shared/global/CI']
+def custom_workspace = [hera: '/scratch3/NCEPDEV/global/role.glopara/CI/HERA', ursa: '/scratch3/NCEPDEV/global/role.glopara/CI/URSA', orion: '/work2/noaa/global/role-global/GFS_CI_CD/ORION/CI', hercules: '/work2/noaa/global/role-global/GFS_CI_CD/HERCULES/CI', gaeac6: '/gpfs/f6/drsa-precip3/world-shared/global/CI']
 def repo_url = 'git@github.com:NOAA-EMC/global-workflow.git'
 
 def STATUS = 'Passed'
@@ -87,7 +87,7 @@ pipeline {
                     Machine = machine[0].toUpperCase() + machine.substring(1)
                     echo "Getting Common Workspace for ${Machine}"
                     ws("${custom_workspace[machine]}/${env.CHANGE_ID}") {
-                        properties([parameters([[$class: 'NodeParameterDefinition', allowedSlaves: ['built-in', 'hercules-emc', 'hera-emc', 'ursa-emc', 'orion-emc', 'gaeaC5', 'gaeaC6-emc'], defaultSlaves: ['built-in'], name: '', nodeEligibility: [$class: 'AllNodeEligibility'], triggerIfResult: 'allCases']])])
+                        properties([parameters([[$class: 'NodeParameterDefinition', allowedSlaves: ['built-in', 'hercules-emc', 'hera-emc', 'ursa-emc', 'orion-emc', 'gaeaC6-emc'], defaultSlaves: ['built-in'], name: '', nodeEligibility: [$class: 'AllNodeEligibility'], triggerIfResult: 'allCases']])])
                         GH = sh(script: "which gh || echo '~/bin/gh'", returnStdout: true).trim()
                         CUSTOM_WORKSPACE = "${WORKSPACE}"
                         HOMEgfs = "${CUSTOM_WORKSPACE}/global-workflow"
diff --git a/dev/ci/Jenkinsfile4AWS b/dev/ci/Jenkinsfile4AWS
index 62237587a18..ff519270456 100644
--- a/dev/ci/Jenkinsfile4AWS
+++ b/dev/ci/Jenkinsfile4AWS
@@ -86,7 +86,7 @@ pipeline {
                     Machine = machine[0].toUpperCase() + machine.substring(1)
                     echo "Getting Common Workspace for ${Machine}"
                     ws("${custom_workspace[machine]}/${env.CHANGE_ID}") {
-                        properties([parameters([[$class: 'NodeParameterDefinition', allowedSlaves: ['built-in', 'Hercules-EMC', 'Hera-EMC', 'Orion-EMC', 'GaeaC5', 'GaeaC6-EMC', 'Awsepicglobalworkflow'], defaultSlaves: ['built-in'], name: '', nodeEligibility: [$class: 'AllNodeEligibility'], triggerIfResult: 'allCases']])])
+                        properties([parameters([[$class: 'NodeParameterDefinition', allowedSlaves: ['built-in', 'Hercules-EMC', 'Hera-EMC', 'Orion-EMC', 'GaeaC6-EMC', 'Awsepicglobalworkflow'], defaultSlaves: ['built-in'], name: '', nodeEligibility: [$class: 'AllNodeEligibility'], triggerIfResult: 'allCases']])])
                         GH = sh(script: "which gh || echo '~/bin/gh'", returnStdout: true).trim()
                         CUSTOM_WORKSPACE = "${custom_workspace[machine]}/${env.CHANGE_ID}/${aws_gw_name}"
                         HOMEgfs = "${CUSTOM_WORKSPACE}/${aws_gw_name}"
diff --git a/dev/ci/cases/pr/C48_ATM_ecflow.yaml b/dev/ci/cases/pr/C48_ATM_ecflow.yaml
index eae20d5a591..7f996fcfdbd 100644
--- a/dev/ci/cases/pr/C48_ATM_ecflow.yaml
+++ b/dev/ci/cases/pr/C48_ATM_ecflow.yaml
@@ -14,7 +14,6 @@ skip_ci_on_hosts:
   - wcoss2
   - hera
   - ursa
-  - gaeac5
   - gaeac6
   - orion
   - hercules
diff --git a/dev/ci/cases/pr/C48_S2SWA_gefs_RT.yaml b/dev/ci/cases/pr/C48_S2SWA_gefs_RT.yaml
index ba6749b1e03..55b0fa15c7f 100644
--- a/dev/ci/cases/pr/C48_S2SWA_gefs_RT.yaml
+++ b/dev/ci/cases/pr/C48_S2SWA_gefs_RT.yaml
@@ -21,7 +21,6 @@ experiment:
 # Add this to run the stage ic job 'icsdir: /lfs/h2/emc/ens/noscrub/eric.sinsky/RETRO_ICS'
 skip_ci_on_hosts:
   - gaeac6
-  - gaeac5
   - hercules
   - wcoss2
   - hera
diff --git a/dev/ci/cases/pr/C48_S2SW_extended.yaml b/dev/ci/cases/pr/C48_S2SW_extended.yaml
index c6e0c29f25c..af676b4dbe6 100644
--- a/dev/ci/cases/pr/C48_S2SW_extended.yaml
+++ b/dev/ci/cases/pr/C48_S2SW_extended.yaml
@@ -14,7 +14,6 @@ experiment:
 skip_ci_on_hosts:
   - hera
   - ursa
-  - gaeac5
   - gaeac6
   - orion
   - hercules
diff --git a/dev/ci/cases/pr/C48mx500_3DVarAOWCDA.yaml b/dev/ci/cases/pr/C48mx500_3DVarAOWCDA.yaml
index 720bac1f691..74ba40c7d85 100644
--- a/dev/ci/cases/pr/C48mx500_3DVarAOWCDA.yaml
+++ b/dev/ci/cases/pr/C48mx500_3DVarAOWCDA.yaml
@@ -16,7 +16,6 @@ experiment:
   yaml: {{ HOMEgfs }}/dev/ci/cases/yamls/soca_gfs_defaults_ci.yaml
 
 skip_ci_on_hosts:
-  - gaeac5
   - orion
   - awsepicglobalworkflow
 
diff --git a/dev/ci/cases/pr/C48mx500_hybAOWCDA.yaml b/dev/ci/cases/pr/C48mx500_hybAOWCDA.yaml
index 905ed594f54..20fcd9001a1 100644
--- a/dev/ci/cases/pr/C48mx500_hybAOWCDA.yaml
+++ b/dev/ci/cases/pr/C48mx500_hybAOWCDA.yaml
@@ -17,7 +17,6 @@ experiment:
   yaml: {{ HOMEgfs }}/dev/ci/cases/yamls/soca_hyb_gfs_defaults_ci.yaml
 
 skip_ci_on_hosts:
-  - gaeac5
   - orion
   - awsepicglobalworkflow
 
diff --git a/dev/ci/cases/pr/C96C48_hybatmDA.yaml b/dev/ci/cases/pr/C96C48_hybatmDA.yaml
index 66cb2168658..a5bc5763415 100644
--- a/dev/ci/cases/pr/C96C48_hybatmDA.yaml
+++ b/dev/ci/cases/pr/C96C48_hybatmDA.yaml
@@ -18,7 +18,6 @@ experiment:
 
 skip_ci_on_hosts:
   - awsepicglobalworkflow
-  - gaeac5
 
 workflow:
   engine: rocoto
diff --git a/dev/ci/cases/pr/C96C48_hybatmsnowDA.yaml b/dev/ci/cases/pr/C96C48_hybatmsnowDA.yaml
index 59ea35b979e..781e62a6579 100644
--- a/dev/ci/cases/pr/C96C48_hybatmsnowDA.yaml
+++ b/dev/ci/cases/pr/C96C48_hybatmsnowDA.yaml
@@ -17,7 +17,6 @@ experiment:
 
 skip_ci_on_hosts:
   - orion
-  - gaeac5
   - hercules
   - awsepicglobalworkflow
 
diff --git a/dev/ci/cases/pr/C96C48_hybatmsoilDA.yaml b/dev/ci/cases/pr/C96C48_hybatmsoilDA.yaml
index 155e67a414c..6e58fcae15b 100644
--- a/dev/ci/cases/pr/C96C48_hybatmsoilDA.yaml
+++ b/dev/ci/cases/pr/C96C48_hybatmsoilDA.yaml
@@ -18,7 +18,6 @@ experiment:
 skip_ci_on_hosts:
   - orion
   - hercules
-  - gaeac5
   - awsepicglobalworkflow
 
 workflow:
diff --git a/dev/ci/cases/pr/C96C48_ufs_hybatmDA.yaml b/dev/ci/cases/pr/C96C48_ufs_hybatmDA.yaml
index eaafc4b3853..f1d660c62bf 100644
--- a/dev/ci/cases/pr/C96C48_ufs_hybatmDA.yaml
+++ b/dev/ci/cases/pr/C96C48_ufs_hybatmDA.yaml
@@ -16,7 +16,6 @@ experiment:
   yaml: {{ HOMEgfs }}/dev/ci/cases/yamls/ufs_hybatmDA_defaults.ci.yaml
 
 skip_ci_on_hosts:
-  - gaeac5
   - gaeac6
   - orion
   - hercules
diff --git a/dev/ci/cases/pr/C96C48_ufsgsi_hybatmDA.yaml b/dev/ci/cases/pr/C96C48_ufsgsi_hybatmDA.yaml
index 14cc30db214..3b41c87dd8b 100644
--- a/dev/ci/cases/pr/C96C48_ufsgsi_hybatmDA.yaml
+++ b/dev/ci/cases/pr/C96C48_ufsgsi_hybatmDA.yaml
@@ -16,7 +16,6 @@ experiment:
   yaml: {{ HOMEgfs }}/dev/ci/cases/yamls/ufsgsi_hybatmDA_defaults.ci.yaml
 
 skip_ci_on_hosts:
-  - gaeac5
   - gaeac6
   - orion
   - hercules
diff --git a/dev/ci/cases/pr/C96C48mx500_S2SW_cyc_gfs.yaml b/dev/ci/cases/pr/C96C48mx500_S2SW_cyc_gfs.yaml
index f7184a4b228..704d53b5835 100644
--- a/dev/ci/cases/pr/C96C48mx500_S2SW_cyc_gfs.yaml
+++ b/dev/ci/cases/pr/C96C48mx500_S2SW_cyc_gfs.yaml
@@ -17,7 +17,6 @@ experiment:
   yaml: {{ HOMEgfs }}/dev/ci/cases/yamls/gfs_cyc_defaults_ci.yaml
 
 skip_ci_on_hosts:
-  - gaeac5
 
 workflow:
   engine: rocoto
diff --git a/dev/ci/cases/pr/C96_atm3DVar.yaml b/dev/ci/cases/pr/C96_atm3DVar.yaml
index 63568627a34..692caffe758 100644
--- a/dev/ci/cases/pr/C96_atm3DVar.yaml
+++ b/dev/ci/cases/pr/C96_atm3DVar.yaml
@@ -15,7 +15,6 @@ experiment:
   yaml: {{ HOMEgfs }}/dev/ci/cases/yamls/gfs_metp_ci.yaml
 
 skip_ci_on_hosts:
-  - gaeac5
   - awsepicglobalworkflow
   - wcoss2
 
diff --git a/dev/ci/cases/pr/C96_atm3DVar_extended.yaml b/dev/ci/cases/pr/C96_atm3DVar_extended.yaml
index fda4f62d1c6..3a7c9323656 100644
--- a/dev/ci/cases/pr/C96_atm3DVar_extended.yaml
+++ b/dev/ci/cases/pr/C96_atm3DVar_extended.yaml
@@ -17,7 +17,6 @@ experiment:
 skip_ci_on_hosts:
   - hera
   - ursa
-  - gaeac5
   - gaeac6
   - orion
   - hercules
diff --git a/dev/ci/cases/pr/C96_gcafs_cycled.yaml b/dev/ci/cases/pr/C96_gcafs_cycled.yaml
index 3a261feb198..2defe20e480 100644
--- a/dev/ci/cases/pr/C96_gcafs_cycled.yaml
+++ b/dev/ci/cases/pr/C96_gcafs_cycled.yaml
@@ -15,7 +15,6 @@ experiment:
   yaml: {{ HOMEgfs }}/dev/ci/cases/yamls/gcafs_cycled_defaults_ci.yaml
 
 skip_ci_on_hosts:
-  - gaeac5
   - awsepicglobalworkflow
 
 workflow:
diff --git a/dev/ci/cases/pr/C96_gcafs_cycled_noDA.yaml b/dev/ci/cases/pr/C96_gcafs_cycled_noDA.yaml
index dbe69605e7f..2bc791ca89c 100644
--- a/dev/ci/cases/pr/C96_gcafs_cycled_noDA.yaml
+++ b/dev/ci/cases/pr/C96_gcafs_cycled_noDA.yaml
@@ -16,7 +16,6 @@ experiment:
 
 skip_ci_on_hosts:
   - orion
-  - gaeac5
   - hercules
   - awsepicglobalworkflow
 
diff --git a/dev/ci/cases/pr/C96mx100_S2S.yaml b/dev/ci/cases/pr/C96mx100_S2S.yaml
index 6049ccdd43e..304ffc57043 100644
--- a/dev/ci/cases/pr/C96mx100_S2S.yaml
+++ b/dev/ci/cases/pr/C96mx100_S2S.yaml
@@ -16,7 +16,6 @@ experiment:
   yaml: {{ HOMEgfs }}/dev/ci/cases/yamls/sfs_defaults.yaml
 
 skip_ci_on_hosts:
-  - gaeac5
   - awsepicglobalworkflow
 
 workflow:
diff --git a/dev/ci/cases/sfsv1/C96mx025_S2S.yaml b/dev/ci/cases/sfsv1/C96mx025_S2S.yaml
index 04510e59ce6..f4632cc0193 100644
--- a/dev/ci/cases/sfsv1/C96mx025_S2S.yaml
+++ b/dev/ci/cases/sfsv1/C96mx025_S2S.yaml
@@ -16,7 +16,6 @@ experiment:
   yaml: {{ HOMEgfs }}/dev/ci/cases/yamls/sfs_CPC_defaults.yaml
 
 skip_ci_on_hosts:
-  - gaeac5
   - awsepicglobalworkflow
 
 workflow:
diff --git a/dev/ci/platforms/config.gaeac5 b/dev/ci/platforms/config.gaeac5
deleted file mode 100644
index afae735a0f6..00000000000
--- a/dev/ci/platforms/config.gaeac5
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/usr/bin/bash
-
-export GFS_CI_ROOT=/gpfs/f5/epic/proj-shared/global/GFS_CI_ROOT
-export ICSDIR_ROOT=/gpfs/f5/epic/proj-shared/global/glopara/data/ICSDIR
-export HPC_ACCOUNT=${HPC_ACCOUNT:-epic}
-export max_concurrent_cases=5
-export max_concurrent_pr=4
diff --git a/dev/ci/scripts/utils/gitlab/launch_gitlab_runner.sh b/dev/ci/scripts/utils/gitlab/launch_gitlab_runner.sh
index 93eb80e1fb6..21bfd657f03 100755
--- a/dev/ci/scripts/utils/gitlab/launch_gitlab_runner.sh
+++ b/dev/ci/scripts/utils/gitlab/launch_gitlab_runner.sh
@@ -26,7 +26,7 @@ host="$(hostname)"
 source "${HOMEgfs_}/ush/detect_machine.sh"
 # Check the MACHINE_ID and set up the environment accordingly
 case "${MACHINE_ID}" in
-    hera | orion | hercules | wcoss2 | gaeac5 | gaeac6)
+    hera | orion | hercules | wcoss2 | gaeac6)
         echo "Running GitLab Runner script on ${MACHINE_ID}"
         ;;
     noaacloud)
diff --git a/dev/ci/scripts/utils/launch_java_agent.sh b/dev/ci/scripts/utils/launch_java_agent.sh
index 5df17cf1784..572668efa5c 100755
--- a/dev/ci/scripts/utils/launch_java_agent.sh
+++ b/dev/ci/scripts/utils/launch_java_agent.sh
@@ -79,7 +79,7 @@ host=$(hostname)
 
 source "${HOMEgfs_}/ush/detect_machine.sh"
 case ${MACHINE_ID} in
-    hera | orion | hercules | wcoss2 | gaeac5 | gaeac6)
+    hera | orion | hercules | wcoss2 | gaeac6)
         echo "Launch Jenkins Java Controler on ${MACHINE_ID}"
         ;;
     noaacloud)
diff --git a/dev/parm/config/gcafs/config.resources b/dev/parm/config/gcafs/config.resources
index 5ef6de40077..3bd2ed049c8 100644
--- a/dev/parm/config/gcafs/config.resources
+++ b/dev/parm/config/gcafs/config.resources
@@ -51,10 +51,6 @@ case ${machine} in
               max_tasks_per_node=192
               mem_node_max="360GB"
     ;;
-  "GAEAC5")
-              max_tasks_per_node=128
-              mem_node_max="251GB"
-    ;;
   "GAEAC6")
               max_tasks_per_node=192
               mem_node_max="384GB"
diff --git a/dev/parm/config/gcafs/config.resources.GAEAC5 b/dev/parm/config/gcafs/config.resources.GAEAC5
deleted file mode 120000
index 7fdc9591603..00000000000
--- a/dev/parm/config/gcafs/config.resources.GAEAC5
+++ /dev/null
@@ -1 +0,0 @@
-../gfs/config.resources.GAEAC5
\ No newline at end of file
diff --git a/dev/parm/config/gefs/config.resources b/dev/parm/config/gefs/config.resources
index 600685925b4..66b53a63f6b 100644
--- a/dev/parm/config/gefs/config.resources
+++ b/dev/parm/config/gefs/config.resources
@@ -22,7 +22,6 @@ case ${machine} in
   "URSA")     max_tasks_per_node=192;;
   "ORION")    max_tasks_per_node=40;;
   "HERCULES") max_tasks_per_node=80;;
-  "GAEAC5")   max_tasks_per_node=128;;
   "GAEAC6")   max_tasks_per_node=192;;
   "AWSPW")
     export PARTITION_BATCH="compute"
diff --git a/dev/parm/config/gefs/config.resources.GAEAC5 b/dev/parm/config/gefs/config.resources.GAEAC5
deleted file mode 120000
index 7fdc9591603..00000000000
--- a/dev/parm/config/gefs/config.resources.GAEAC5
+++ /dev/null
@@ -1 +0,0 @@
-../gfs/config.resources.GAEAC5
\ No newline at end of file
diff --git a/dev/parm/config/gfs/config.resources b/dev/parm/config/gfs/config.resources
index 9229d742f9c..5afb46b7c34 100644
--- a/dev/parm/config/gfs/config.resources
+++ b/dev/parm/config/gfs/config.resources
@@ -49,10 +49,6 @@ case ${machine} in
               max_tasks_per_node=192
               mem_node_max="360GB"
     ;;
-  "GAEAC5")
-              max_tasks_per_node=128
-              mem_node_max="251GB"
-    ;;
   "GAEAC6")
               max_tasks_per_node=192
               mem_node_max="384GB"
diff --git a/dev/parm/config/gfs/config.resources.GAEAC5 b/dev/parm/config/gfs/config.resources.GAEAC5
deleted file mode 100644
index cbf1cc85b1c..00000000000
--- a/dev/parm/config/gfs/config.resources.GAEAC5
+++ /dev/null
@@ -1,9 +0,0 @@
-#! /usr/bin/env bash
-# shellcheck disable=SC2034
-
-# GaeaC5-specific job resources
-
-export FI_VERBS_PREFER_XRC=0
-
-unset memory
-unset "memory_${RUN}"
diff --git a/dev/ush/load_modules.sh b/dev/ush/load_modules.sh
index 673122d95d0..91039d23816 100755
--- a/dev/ush/load_modules.sh
+++ b/dev/ush/load_modules.sh
@@ -98,7 +98,7 @@ case "${MODULE_TYPE}" in
         module use "${HOMEgfs}/sorc/gdas.cd/modulefiles"
 
         case "${MACHINE_ID}" in
-            "hera" | "orion" | "hercules" | "wcoss2" | "gaeac5" | "gaeac6" | "ursa" | "noaacloud")
+            "hera" | "orion" | "hercules" | "wcoss2" | "gaeac6" | "ursa" | "noaacloud")
                 #TODO: Remove LMOD_TMOD_FIND_FIRST line when spack-stack on WCOSS2
                 if [[ "${MACHINE_ID}" == "wcoss2" ]]; then
                     export LMOD_TMOD_FIND_FIRST=yes
diff --git a/dev/workflow/hosts.py b/dev/workflow/hosts.py
index 0093674df89..2a2fcf42cb6 100644
--- a/dev/workflow/hosts.py
+++ b/dev/workflow/hosts.py
@@ -16,7 +16,7 @@ class Host:
     """
 
     SUPPORTED_HOSTS = ['HERA', 'URSA', 'ORION', 'HERCULES', 'WCOSS2', 'CONTAINER',
-                       'GAEAC5', 'GAEAC6', 'AWSPW', 'AZUREPW', 'GOOGLEPW']
+                       'GAEAC6', 'AWSPW', 'AZUREPW', 'GOOGLEPW']
 
     def __init__(self, host=None):
 
@@ -84,8 +84,6 @@ def detect(self) -> None:
             self.machine = socket.gethostname().split("-", 1)[0].upper()
         elif os.path.exists('/lfs/f1'):
             self.machine = 'WCOSS2'
-        elif os.path.exists('/gpfs/f5'):
-            self.machine = 'GAEAC5'
         elif os.path.exists('/gpfs/f6'):
             self.machine = 'GAEAC6'
         elif container is not None:
diff --git a/dev/workflow/hosts/gaeac5.yaml b/dev/workflow/hosts/gaeac5.yaml
deleted file mode 100644
index 785f0c61149..00000000000
--- a/dev/workflow/hosts/gaeac5.yaml
+++ /dev/null
@@ -1,34 +0,0 @@
-# Paths
-DMPDIR: '/gpfs/f5/ufs-ard/world-shared/global/glopara/data/dump'
-IODADIR: '/gpfs/f5/ufs-ard/world-shared/global/glopara/data/dump'
-BASE_GIT: '/gpfs/f5/ufs-ard/world-shared/global/glopara/data/git'
-BASE_DATA: '/gpfs/f5/ufs-ard/world-shared/global/glopara/data'
-BASE_IC: '/gpfs/f5/ufs-ard/world-shared/global/glopara/data/ICSDIR'
-AERO_INPUTS_DIR: '/gpfs/f5/ufs-ard/world-shared/global/glopara/data/GEFS_ExtData/20250310'
-PACKAGEROOT: '/gpfs/f5/ufs-ard/world-shared/global/glopara/data/nwpara'
-HOMEDIR: '/gpfs/f5/${ACCOUNT}/scratch/${USER}'
-STMP: '/gpfs/f5/${ACCOUNT}/scratch/${USER}'
-PTMP: '/gpfs/f5/${ACCOUNT}/scratch/${USER}'
-NOSCRUB: '${HOMEDIR}'
-COMINsyn: '/gpfs/f5/ufs-ard/world-shared/global/glopara/data/com/gfs/prod/syndat'
-# BQS properties
-SCHEDULER: slurm
-QUEUE: normal
-QUEUE_SERVICE: normal
-QUEUE_DTN: 'hpss'
-PARTITION_BATCH: batch
-PARTITION_SERVICE: batch
-PARTITION_DTN: 'dtn_f5_f6'
-CLUSTERS: 'c5'
-CLUSTERS_DTN: 'es'
-CONSTRAINT_DTN: 'f5'
-RESERVATION: ''
-# HPSS properties
-HPSS_PROJECT: emc-global
-ARCHCOM_TO: 'local'
-ATARDIR: '${NOSCRUB}/archive_rotdir/${PSLOT}'
-CHGRP_RSTPROD: 'NO'
-CHGRP_CMD: 'chgrp rstprod'
-# Features
-SUPPORTED_RESOLUTIONS: ['C384', 'C192', 'C96', 'C48']
-DO_ARCHCOM: 'NO'
diff --git a/env/GAEAC5.env b/env/GAEAC5.env
deleted file mode 100755
index e4e7dcf2e7d..00000000000
--- a/env/GAEAC5.env
+++ /dev/null
@@ -1,330 +0,0 @@
-#! /usr/bin/env bash
-
-if [[ $# -ne 1 ]]; then
-
-    echo "Must specify an input argument to set runtime environment variables!"
-    exit 1
-
-fi
-
-step=$1
-
-export launcher="srun -l --export=ALL"
-export mpmd_opt="--multi-prog --output=mpmd.%j.%t.out"
-
-export OMP_STACKSIZE=2048000
-export NTHSTACK=1024000000
-
-ulimit -s unlimited
-ulimit -a
-
-# Calculate common variables
-# Check first if the dependent variables are set
-if [[ -n "${ntasks:-}" && -n "${max_tasks_per_node:-}" && -n "${tasks_per_node:-}" ]]; then
-    max_threads_per_task=$((max_tasks_per_node / tasks_per_node))
-    NTHREADSmax=${threads_per_task:-${max_threads_per_task}}
-    NTHREADS1=${threads_per_task:-1}
-    if [[ ${NTHREADSmax} -gt ${max_threads_per_task} ]]; then
-        NTHREADSmax=${max_threads_per_task}
-    fi
-    if [[ ${NTHREADS1} -gt ${max_threads_per_task} ]]; then
-        NTHREADS1=${max_threads_per_task}
-    fi
-    # This may be useful when GaeaC5 is fully ported, so ignore SC warning
-    # shellcheck disable=SC2034
-    APRUN_default="${launcher} -n ${ntasks}"
-else
-    echo "ERROR config.resources must be sourced before sourcing GAEAC5.env"
-    exit 2
-fi
-
-case ${step} in
- "prep" | "prepbufr")
-
-    export POE="NO"
-    export BACK=${BACK:-"YES"}
-    export sys_tp="GAEAC5"
-    export launcher_PREP="srun"
- ;;
- "prep_emissions")
-
-    export NTHREADS_PREP_EMISSIONS=${NTHREADSmax}
-    export APRUN="${APRUN_default} --cpus-per-task=${NTHREADS_PREP_EMISSIONS}"
- ;;
- "waveinit" | "waveprep" | "wavepostsbs" | "wavepostbndpnt" | "wavepostpnt" | "wavepostbndpntbll" | "wave_stat" | "wave_stat_pnt" )
-
-    export USE_CFP="YES"
-    if [[ "${step}" == "waveprep" ]]; then
-        export MP_PULSE=0
-    fi
-    export wavempexec=${launcher}
-    export wave_mpmd=${mpmd_opt}
-
- ;;
- "atmanlvar")
-
-    export NTHREADS_ATMANLVAR=${NTHREADSmax}
-    export APRUN_ATMANLVAR="${APRUN_default} --cpus-per-task=${NTHREADS_ATMANLVAR}"
- ;;
- "atmanlfv3inc")
-
-    export NTHREADS_ATMANLFV3INC=${NTHREADSmax}
-    export APRUN_ATMANLFV3INC="${APRUN_default} --cpus-per-task=${NTHREADS_ATMANLFV3INC}"
- ;;
- "atmensanlobs")
-
-    export NTHREADS_ATMENSANLOBS=${NTHREADSmax}
-    export APRUN_ATMENSANLOBS="${APRUN_default} --cpus-per-task=${NTHREADS_ATMENSANLOBS}"
- ;;
- "atmensanlsol")
-
-    export NTHREADS_ATMENSANLSOL=${NTHREADSmax}
-    export APRUN_ATMENSANLSOL="${APRUN_default} --cpus-per-task=${NTHREADS_ATMENSANLSOL}"
- ;;
- "atmensanlletkf")
-
-    export NTHREADS_ATMENSANLLETKF=${NTHREADSmax}
-    export APRUN_ATMENSANLLETKF="${APRUN_default} --cpus-per-task=${NTHREADS_ATMENSANLLETKF}"
- ;;
- "atmensanlfv3inc")
-
-    export NTHREADS_ATMENSANLFV3INC=${NTHREADSmax}
-    export APRUN_ATMENSANLFV3INC="${APRUN_default} --cpus-per-task=${NTHREADS_ATMENSANLFV3INC}"
- ;;
- "aeroanlvar")
-
-    export APRUNCFP="${launcher} -n \$ncmd ${mpmd_opt}"
-
-    export NTHREADS_AEROANL=${NTHREADSmax}
-    export APRUN_AEROANL="${APRUN_default} --cpus-per-task=${NTHREADS_AEROANL}"
- ;;
- "aeroanlgenb")
-
-    export NTHREADS_AEROANLGENB=${NTHREADSmax}
-    export APRUN_AEROANLGENB="${APRUN_default} --cpus-per-task=${NTHREADS_AEROANLGENB}"
- ;;
-
- "snowanl")
-
-    export APRUN_CALCFIMS="${launcher} -n 1"
-
-    export NTHREADS_SNOWANL=${NTHREADSmax}
-    export APRUN_SNOWANL="${APRUN_default} --cpus-per-task=${NTHREADS_SNOWANL}"
-
-    export APRUN_APPLY_INCR="${launcher} -n 6"
- ;;
- "esnowanl")
-
-    export APRUN_CALCFIMS="${launcher} -n 1"
-
-    export NTHREADS_ESNOWANL=${NTHREADSmax}
-    export APRUN_ESNOWANL="${APRUN_default} --cpus-per-task=${NTHREADS_ESNOWANL}"
-
-    export APRUN_APPLY_INCR="${launcher} -n 6"
- ;;
- "marinebmat")
-
-    export APRUNCFP="${launcher} -n \$ncmd ${mpmd_opt}"
-    export APRUN_MARINEBMAT="${APRUN_default}"
- ;;
- "marineanlvar")
-
-    export APRUNCFP="${launcher} -n \$ncmd ${mpmd_opt}"
-    export APRUN_MARINEANLVAR="${APRUN_default}"
- ;;
- "marineanlecen")
-
-    export APRUN_MARINEANLECEN="${APRUN_default}"
- ;;
- "marineanlchkpt")
-
-    export APRUNCFP="${launcher} -n \$ncmd ${mpmd_opt}"
-
-    export NTHREADS_OCNANAL=${NTHREADSmax}
-    export APRUN_MARINEANLCHKPT="${APRUN_default} --cpus-per-task=${NTHREADS_OCNANAL}"
-
-    export APRUN_MARINEANLOBSSTATS="${launcher} -n 1"
- ;;
- "marineanlletkf")
-
-    export NTHREADS_MARINEANLLETKF=${NTHREADSmax}
-    export APRUN_MARINEANLLETKF="${APRUN_default}"
- ;;
- "ecen_fv3jedi")
-
-    export NTHREADS_ECEN_FV3JEDI=${NTHREADSmax}
-    export APRUN_CORRECTION_INCREMENT="${launcher} -n ${ntasks_correction_increment} --cpus-per-task=${NTHREADS_ECEN_FV3JEDI}"
-    export APRUN_ENSEMBLE_RECENTER="${launcher} -n ${ntasks_ensemble_recenter} --cpus-per-task=${NTHREADS_ECEN_FV3JEDI}"
- ;;
- "analcalc_fv3jedi")
-
-    export NTHREADS_ANALCALC_FV3JEDI=${NTHREADSmax}
-    export APRUN_ANALCALC_FV3JEDI="${APRUN_default} --cpus-per-task=${NTHREADS_ANALCALC_FV3JEDI}"
- ;;
- "anal" | "analcalc")
-
-    export MKL_NUM_THREADS=4
-    export MKL_CBWR=AUTO
-
-    export CFP_MP=${CFP_MP:-"YES"}
-    export USE_CFP=${USE_CFP:-"YES"}
-    export APRUNCFP="${launcher} -n \$ncmd ${mpmd_opt}"
-
-    export NTHREADS_GSI=${threads_per_task_anal:-${max_threads_per_task}}
-    export APRUN_GSI="${APRUN_default} --cpus-per-task=${NTHREADS_GSI}"
-
-    export NTHREADS_CALCINC=${threads_per_task_calcinc:-1}
-    if [[ ${NTHREADS_CALCINC} -gt ${max_threads_per_task} ]]; then
-        export NTHREADS_CALCINC=${max_threads_per_task}
-    fi
-    export APRUN_CALCINC="${launcher} \$ncmd --cpus-per-task=${NTHREADS_CALCINC}"
-
-    export NTHREADS_CYCLE=${threads_per_task_cycle:-12}
-    if [[ ${NTHREADS_CYCLE} -gt ${max_tasks_per_node} ]]; then
-        export NTHREADS_CYCLE=${max_tasks_per_node}
-    fi
-    ntasks_cycle=${ntiles:-6}
-    export APRUN_CYCLE="${launcher} -n ${ntasks_cycle} --cpus-per-task=${NTHREADS_CYCLE}"
-
-    export NTHREADS_GAUSFCANL=1
-    ntasks_gausfcanl=${ntasks_gausfcanl:-1}
-    export APRUN_GAUSFCANL="${launcher} -n ${ntasks_gausfcanl} --cpus-per-task=${NTHREADS_GAUSFCANL}"
- ;;
- "sfcanl")
-
-    export NTHREADS_CYCLE=${threads_per_task:-14}
-    if [[ ${NTHREADS_CYCLE} -gt ${max_tasks_per_node} ]]; then
-        export NTHREADS_CYCLE=${max_tasks_per_node}
-    fi
-    export APRUN_CYCLE="${APRUN_default} --cpus-per-task=${NTHREADS_CYCLE}"
-
-    # REGRID requires 6 tasks for reproducibility
-    ntasks_regrid=6
-    export APRUN_REGRID="${launcher} -n ${ntasks_regrid} "
-
- ;;
- "eobs")
-
-    export MKL_NUM_THREADS=4
-    export MKL_CBWR=AUTO
-
-    export CFP_MP=${CFP_MP:-"YES"}
-    export USE_CFP=${USE_CFP:-"YES"}
-    export APRUNCFP="${launcher} -n \$ncmd ${mpmd_opt}"
-
-
-    export NTHREADS_GSI=${NTHREADSmax}
-    if [[ ${NTHREADS_GSI} -gt ${max_threads_per_task} ]]; then
-        export NTHREADS_GSI=${max_threads_per_task}
-    fi
-    export APRUN_GSI="${APRUN_default} --cpus-per-task=${NTHREADS_GSI}"
- ;;
- "eupd")
-
-    export CFP_MP=${CFP_MP:-"YES"}
-    export USE_CFP=${USE_CFP:-"YES"}
-    export APRUNCFP="${launcher} -n \$ncmd ${mpmd_opt}"
-
-
-    export NTHREADS_ENKF=${NTHREADSmax}
-    export APRUN_ENKF="${launcher} -n ${ntasks_enkf:-${ntasks}} --cpus-per-task=${NTHREADS_ENKF}"
- ;;
- "fcst" | "efcs")
-
-    export OMP_STACKSIZE=512M
-
-    (( nnodes = (ntasks+tasks_per_node-1)/tasks_per_node ))
-    (( ufs_ntasks = nnodes*tasks_per_node ))
-    # With ESMF threading, the model wants to use the full node
-    export APRUN_UFS="${launcher} -n ${ufs_ntasks}"
-    unset nnodes ufs_ntasks
- ;;
- "upp")
-
-    export NTHREADS_UPP=${NTHREADS1}
-    export APRUN_UPP="${APRUN_default} --cpus-per-task=${NTHREADS_UPP}"
- ;;
- "atmos_products")
-
-    export USE_CFP="YES"  # Use MPMD for downstream product generation
- ;;
- "oceanice_products")
-
-    export NTHREADS_OCNICEPOST=${NTHREADS1}
-    export APRUN_OCNICEPOST="${launcher} -n 1 --cpus-per-task=${NTHREADS_OCNICEPOST}"
- ;;
- "ecen")
-
-    export NTHREADS_ECEN=${NTHREADSmax}
-    export APRUN_ECEN="${APRUN_default} --cpus-per-task=${NTHREADS_ECEN}"
-
-    export NTHREADS_CHGRES=${threads_per_task_chgres:-12}
-    if [[ ${NTHREADS_CHGRES} -gt ${max_tasks_per_node} ]]; then
-        export NTHREADS_CHGRES=${max_tasks_per_node}
-    fi
-    export APRUN_CHGRES="time"
-
-    export NTHREADS_CALCINC=${threads_per_task_calcinc:-1}
-    if [[ ${NTHREADS_CALCINC} -gt ${max_threads_per_task} ]]; then
-        export NTHREADS_CALCINC=${max_threads_per_task}
-    fi
-    export APRUN_CALCINC="${APRUN_default} --cpus-per-task=${NTHREADS_CALCINC}"
-
- ;;
- "esfc")
-
-    export NTHREADS_ESFC=${NTHREADSmax}
-    export APRUN_ESFC="${APRUN_default} --cpus-per-task=${NTHREADS_ESFC}"
-
-    export NTHREADS_CYCLE=${threads_per_task_cycle:-14}
-    if [[ ${NTHREADS_CYCLE} -gt ${max_tasks_per_node} ]]; then
-        export NTHREADS_CYCLE=${max_tasks_per_node}
-    fi
-    export APRUN_CYCLE="${APRUN_default} --cpus-per-task=${NTHREADS_CYCLE}"
-
-    # REGRID requires 6*NMEM_ENS tasks for reproducibility
-    export APRUN_REGRID="${launcher} -n ${ntasks}"
-
- ;;
- "epos")
-
-    export NTHREADS_EPOS=${NTHREADSmax}
-    export APRUN_EPOS="${APRUN_default} --cpus-per-task=${NTHREADS_EPOS}"
-
- ;;
- "postsnd")
-
-    export CFP_MP="YES"
-
-    export NTHREADS_POSTSND=${NTHREADS1}
-    export APRUN_POSTSND="${APRUN_default} --cpus-per-task=${NTHREADS_POSTSND}"
-
-    export NTHREADS_POSTSNDCFP=${threads_per_task_postsndcfp:-1}
-    if [[ ${NTHREADS_POSTSNDCFP} -gt ${max_threads_per_task} ]]; then
-        export NTHREADS_POSTSNDCFP=${max_threads_per_task}
-    fi
-    export APRUN_POSTSNDCFP="${launcher} -n ${ntasks_postsndcfp} ${mpmd_opt}"
-
- ;;
- "awips")
-
-    export NTHREADS_AWIPS=${NTHREADS1}
-    export APRUN_AWIPSCFP="${APRUN_default} ${mpmd_opt}"
-
- ;;
- "gempak")
-
-    echo "WARNING: ${step} is not enabled on ${machine}!"
-
- ;;
- "fit2obs")
-
-    export NTHREADS_FIT2OBS=${NTHREADS1}
-    export MPIRUN="${APRUN_default} --cpus-per-task=${NTHREADS_FIT2OBS}"
-
- ;;
- *)
-    # Some other job not yet defined here
-    echo "WARNING: The job step ${step} does not specify GAEAC5-specific resources"
- ;;
-esac
diff --git a/sorc/link_workflow.sh b/sorc/link_workflow.sh
index c75d9ca605b..ee17db4784b 100755
--- a/sorc/link_workflow.sh
+++ b/sorc/link_workflow.sh
@@ -74,7 +74,6 @@ case "${machine}" in
     "hera" | "ursa") FIX_DIR="/scratch3/NCEPDEV/global/role.glopara/fix" ;;
     "orion") FIX_DIR="/work2/noaa/global/role-global/fix" ;;
     "hercules") FIX_DIR="/work2/noaa/global/role-global/fix" ;;
-    "gaeac5") FIX_DIR="/gpfs/f5/ufs-ard/world-shared/global/glopara/data/fix" ;;
     "gaeac6") FIX_DIR="/gpfs/f6/drsa-precip3/world-shared/role.glopara/fix" ;;
     "noaacloud") FIX_DIR="/lustre/fix" ;;
     *)
diff --git a/ush/detect_machine.sh b/ush/detect_machine.sh
index 070904eb683..05cd7187207 100755
--- a/ush/detect_machine.sh
+++ b/ush/detect_machine.sh
@@ -23,9 +23,6 @@ case $(hostname -f) in
     dlogin0[1-9].dogwood.wcoss2.ncep.noaa.gov) MACHINE_ID=wcoss2 ;; ### dogwood01-9
     dlogin10.dogwood.wcoss2.ncep.noaa.gov) MACHINE_ID=wcoss2 ;;     ### dogwood10
 
-    gaea5[1-8]) MACHINE_ID=gaeac5 ;;          ### gaea51-58
-    gaea5[1-8].ncrc.gov) MACHINE_ID=gaeac5 ;; ### gaea51-58
-
     gaea6[1-8]) MACHINE_ID=gaeac6 ;;          ### gaea61-68
     gaea6[1-8].ncrc.gov) MACHINE_ID=gaeac6 ;; ### gaea61-68
 
@@ -98,9 +95,6 @@ elif [[ -d /work ]]; then
     else
         MACHINE_ID=orion
     fi
-elif [[ -d /gpfs/f5 ]]; then
-    # We are on GAEAC5.
-    MACHINE_ID=gaeac5
 elif [[ -d /gpfs/f6 ]]; then
     # We are on GAEAC6.
     MACHINE_ID=gaeac6
diff --git a/ush/module-setup.sh b/ush/module-setup.sh
index 13e41879804..d15f152809e 100755
--- a/ush/module-setup.sh
+++ b/ush/module-setup.sh
@@ -63,17 +63,6 @@ elif [[ ${MACHINE_ID} = stampede* ]]; then
     fi
     module purge
 
-elif [[ ${MACHINE_ID} = gaeac5 ]]; then
-    # We are on GAEA C5.
-    if (! eval module help > /dev/null 2>&1); then
-        # We cannot simply load the module command.  The GAEA
-        # /etc/profile modifies a number of module-related variables
-        # before loading the module command.  Without those variables,
-        # the module command fails.  Hence we actually have to source
-        # /etc/profile here.
-        source /etc/profile
-    fi
-    module reset
 elif [[ ${MACHINE_ID} = gaeac6 ]]; then
     # We are on GAEA C6.
     if (! eval module help > /dev/null 2>&1); then