diff --git a/bundle/CMakeLists.txt b/bundle/CMakeLists.txt
index 9559db59..ff11b5a2 100644
--- a/bundle/CMakeLists.txt
+++ b/bundle/CMakeLists.txt
@@ -107,6 +107,9 @@ endif()
     ecbuild_bundle( PROJECT iodaconv SOURCE "../sorc/iodaconv" )
   endif()
 
+# rdas mega executable
+  ecbuild_bundle( PROJECT rdas SOURCE "../mains" )
+
 # ioda, ufo, fv3-jedi, and saber test data
 #---------------------------------
   if(CLONE_JCSDADATA)
@@ -140,6 +143,7 @@ endif()
 
   ecbuild_bundle( PROJECT rrfs-test SOURCE "../rrfs-test" )
   endif(CLONE_RRFSDATA)
+
 endif(BUILD_RDASBUNDLE)
 
 # Finalize bundle
diff --git a/mains/CMakeLists.txt b/mains/CMakeLists.txt
new file mode 100644
index 00000000..8f01690f
--- /dev/null
+++ b/mains/CMakeLists.txt
@@ -0,0 +1,35 @@
+# Build the big rdas executable used for all generic JEDI applications
+# --------------------------------------------------------------------
+
+#---------------------------------
+
+# Standard compiler flags
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+set(CMAKE_C_EXTENSIONS OFF)
+set(CMAKE_FORTRAN_STANDARD 08)
+set(CMAKE_FORTRAN_STANDARD_REQUIRED ON)
+set(CMAKE_FORTRAN_EXTENSIONS OFF)
+
+if ( FV3_DYCORE )
+
+   find_package( fv3jedi REQUIRED )
+   ecbuild_add_executable( TARGET  rdas_fv3jedi.x
+                           SOURCES rdas_fv3jedi.cc
+                           LIBS    fv3jedi
+                         )
+
+endif()
+
+if ( MPAS_DYCORE )
+
+   find_package( mpasjedi REQUIRED )
+   ecbuild_add_executable( TARGET  rdas_mpasjedi.x
+                           SOURCES rdas_mpasjedi.cc
+                           LIBS    mpasjedi
+                         )
+
+endif()
diff --git a/mains/rdas_fv3jedi.cc b/mains/rdas_fv3jedi.cc
new file mode 100644
index 00000000..2150dd9d
--- /dev/null
+++ b/mains/rdas_fv3jedi.cc
@@ -0,0 +1,108 @@
+// -------------------------------------------------------------------------------------------------
+
+#include <functional>
+#include <map>
+
+#include "fv3jedi/ObsLocalization/instantiateObsLocFactory.h"
+#include "fv3jedi/Utilities/Traits.h"
+
+#include "oops/generic/instantiateModelFactory.h"
+#include "saber/oops/instantiateCovarFactory.h"
+#include "saber/oops/ErrorCovarianceToolbox.h"
+#include "ufo/instantiateObsErrorFactory.h"
+#include "ufo/instantiateObsFilterFactory.h"
+#include "ufo/ObsTraits.h"
+
+#include "oops/runs/ConvertState.h"
+#include "oops/runs/HofX4D.h"
+#include "oops/runs/LocalEnsembleDA.h"
+#include "oops/runs/Run.h"
+#include "oops/runs/Variational.h"
+
+// -------------------------------------------------------------------------------------------------
+
+template<typename Traits>
+int runApp(int argc, char** argv, const std::string appName) {
+
+  // Create the Run object
+  oops::Run run(argc, argv);
+
+  // Instantiate oops factories
+  oops::instantiateModelFactory<Traits>();
+
+  // Instantiate saber factories
+  saber::instantiateCovarFactory<Traits>();
+
+  // Intantiate ufo factories
+  ufo::instantiateObsErrorFactory();
+  ufo::instantiateObsFilterFactory();
+
+  // Localization for ensemble DA
+  if (appName == "localensembleda") {
+    fv3jedi::instantiateObsLocFactory();
+  }
+
+  // Application pointer
+  std::unique_ptr<oops::Application> app;
+
+  // Define a map from app names to lambda functions that create unique_ptr to Applications
+  std::map<std::string, std::function<std::unique_ptr<oops::Application>()>> apps;
+
+  apps["convertstate"] = []() {
+      return std::make_unique<oops::ConvertState<Traits>>();
+  };
+  apps["bump"] = []() {
+      return std::make_unique<saber::ErrorCovarianceToolbox<Traits>>();
+  };
+  apps["hofx4d"] = []() {
+      return std::make_unique<oops::HofX4D<Traits, ufo::ObsTraits>>();
+  };
+  apps["localensembleda"] = []() {
+      return std::make_unique<oops::LocalEnsembleDA<fv3jedi::Traits, ufo::ObsTraits>>();
+  };
+  apps["variational"] = []() {
+    return std::make_unique<oops::Variational<Traits, ufo::ObsTraits>>();
+  };
+
+  // Create application object and point to it
+  auto it = apps.find(appName);
+
+  // Run the application
+  return run.execute(*(it->second()));
+}
+
+// -------------------------------------------------------------------------------------------------
+
+int main(int argc,  char ** argv) {
+  // Check that the number of arguments is correct
+  // ----------------------------------------------
+  ASSERT_MSG(argc >= 2, "Usage: " + std::string(argv[0]) + " <application> <options>");
+
+  // Get the application to be run
+  std::string app = argv[1];
+  for (char &c : app) {c = std::tolower(c);}
+
+  // Check that the application is recognized
+  // ----------------------------------------
+  const std::set<std::string> validApps = {
+    "convertstate",
+    "bump",
+    "hofx4d",
+    "localensembleda",
+    "variational"
+  };
+  ASSERT_MSG(validApps.find(app) != validApps.end(), "Application not recognized: " + app);
+
+  // Remove program from argc and argv
+  // --------------------------------------------
+  argv[1] = argv[0];  // Move executable name to second position
+  argv += 1;          // Move pointer up two
+  argc -= 1;          // Remove 1 from count
+
+  // Call application specific main functions
+  // ----------------------------------------
+  fv3jedi::instantiateObsLocFactory();
+  return runApp<fv3jedi::Traits>(argc, argv, app);
+}
+
+// -------------------------------------------------------------------------------------------------
diff --git a/mains/rdas_mpasjedi.cc b/mains/rdas_mpasjedi.cc
new file mode 100644
index 00000000..1fdb22ba
--- /dev/null
+++ b/mains/rdas_mpasjedi.cc
@@ -0,0 +1,116 @@
+// -------------------------------------------------------------------------------------------------
+
+#include <functional>
+#include <map>
+
+#include "oops/generic/instantiateModelFactory.h"
+#include "saber/oops/instantiateCovarFactory.h"
+#include "saber/oops/ErrorCovarianceToolbox.h"
+#include "saber/oops/instantiateLocalizationFactory.h"
+#include "ufo/instantiateObsErrorFactory.h"
+#include "ufo/instantiateObsFilterFactory.h"
+#include "ufo/instantiateObsLocFactory.h"
+#include "ufo/ObsTraits.h"
+
+#include "oops/runs/ConvertState.h"
+#include "oops/runs/HofX4D.h"
+#include "oops/runs/LocalEnsembleDA.h"
+#include "oops/runs/Run.h"
+#include "oops/runs/Variational.h"
+#include "mpasjedi/Traits.h"
+
+// -------------------------------------------------------------------------------------------------
+
+template<typename Traits>
+int runApp(int argc, char** argv, const std::string appName) {
+
+  // Create the Run object
+  oops::Run run(argc, argv);
+
+  // Instantiate oops factories
+  oops::instantiateModelFactory<Traits>();
+
+  // Instantiate saber factories
+  saber::instantiateCovarFactory<Traits>();
+
+  // Intantiate ufo factories
+  ufo::instantiateObsErrorFactory();
+  ufo::instantiateObsFilterFactory();
+
+  // Localization for ensemble DA
+  if (appName == "localensembleda") {
+    ufo::instantiateObsLocFactory<Traits>();
+  }
+
+  // Localization for variational DA
+  if (appName == "variational") {
+    saber::instantiateLocalizationFactory<Traits>();
+  }
+
+  // Intantiate ufo factories
+  ufo::instantiateObsErrorFactory();
+  ufo::instantiateObsFilterFactory();
+
+  // Application pointer
+  std::unique_ptr<oops::Application> app;
+
+  // Define a map from app names to lambda functions that create unique_ptr to Applications
+  std::map<std::string, std::function<std::unique_ptr<oops::Application>()>> apps;
+
+  apps["convertstate"] = []() {
+      return std::make_unique<oops::ConvertState<Traits>>();
+  };
+  apps["bump"] = []() {
+      return std::make_unique<saber::ErrorCovarianceToolbox<Traits>>();
+  };
+  apps["hofx4d"] = []() {
+      return std::make_unique<oops::HofX4D<Traits, ufo::ObsTraits>>();
+  };
+  apps["localensembleda"] = []() {
+      return std::make_unique<oops::LocalEnsembleDA<mpas::Traits, ufo::ObsTraits>>();
+  };
+  apps["variational"] = []() {
+    return std::make_unique<oops::Variational<Traits, ufo::ObsTraits>>();
+  };
+
+  // Create application object and point to it
+  auto it = apps.find(appName);
+
+  // Run the application
+  return run.execute(*(it->second()));
+}
+
+// -------------------------------------------------------------------------------------------------
+
+int main(int argc,  char ** argv) {
+  // Check that the number of arguments is correct
+  // ----------------------------------------------
+  ASSERT_MSG(argc >= 2, "Usage: " + std::string(argv[0]) + " <application> <options>");
+
+  // Get the application to be run
+  std::string app = argv[1];
+  for (char &c : app) {c = std::tolower(c);}
+
+  // Check that the application is recognized
+  // ----------------------------------------
+  const std::set<std::string> validApps = {
+    "convertstate",
+    "bump",
+    "hofx4d",
+    "localensembleda",
+    "variational"
+  };
+  ASSERT_MSG(validApps.find(app) != validApps.end(), "Application not recognized: " + app);
+
+  // Remove program from argc and argv
+  // --------------------------------------------
+  argv[1] = argv[0];  // Move executable name to second position
+  argv += 1;          // Move pointer up two
+  argc -= 1;          // Remove 1 from count
+
+  // Call application specific main functions
+  // ----------------------------------------
+  return runApp<mpas::Traits>(argc, argv, app);
+}
+
+// -------------------------------------------------------------------------------------------------
diff --git a/rrfs-test/CMakeLists.txt b/rrfs-test/CMakeLists.txt
index 5294f134..e5659d06 100644
--- a/rrfs-test/CMakeLists.txt
+++ b/rrfs-test/CMakeLists.txt
@@ -73,6 +73,7 @@ if (CLONE_RRFSDATA)
          set(RESTORE_MPI_ARGS ${MPI_ARGS})
          set(MPI_ARGS "${MPI_ARGS} --exclusive")
       endif()   
+      set(MPI_ARGS "${MPI_ARGS} --ntasks-per-node=18")
 
       get_all_keys(rrfs_mpasjedi_tests caselist)
       foreach(case ${caselist})