diff --git a/internal/scripts/docker/Dockerfile.copy b/internal/scripts/docker/Dockerfile.copy
index c2ac11f4..47eca63b 100644
--- a/internal/scripts/docker/Dockerfile.copy
+++ b/internal/scripts/docker/Dockerfile.copy
@@ -6,61 +6,50 @@ MAINTAINER Tatiana Burek <tatiana@ucar.edu>
 # This Dockerfile checks out the METviewer dependencies from GitHub
 # and builds the local version of the METviewer code.
 #
-ENV METVIEWER_GIT_NAME develop
-ENV METCALCPY_GIT_NAME develop
-ENV METPLOTPY_GIT_NAME develop
-ENV METDATAIO_GIT_NAME develop
 
 #
-# Constants
+# SOURCE_BRANCH is not defined when built via DockerHub.
 #
-ENV TOMCAT_MINOR_VERSION 5.61
-ENV TOMCAT_MAJOR_VERSION 8
-ENV TOMCAT_VERSION ${TOMCAT_MAJOR_VERSION}.${TOMCAT_MINOR_VERSION}
-
-ENV METCALCPY_GIT_URL  https://github.com/dtcenter/METcalcpy
-ENV METPLOTPY_GIT_URL  https://github.com/dtcenter/METplotpy
-ENV METDATAIO_GIT_URL  https://github.com/dtcenter/METdataio
+ARG SOURCE_BRANCH
+RUN if [ "x${SOURCE_BRANCH}" = "x" ]; then \
+      echo "ERROR: SOURCE_BRANCH undefined! Rebuild with \"--build-arg SOURCE_BRANCH={branch name}\""; \
+      exit 1; \
+    else \
+      echo "Build Argument SOURCE_BRANCH=${SOURCE_BRANCH}"; \
+    fi
 
 #
 # METVIEWER_GIT_NAME is required.
 #
+ARG METVIEWER_GIT_NAME 
 RUN if [ "x${METVIEWER_GIT_NAME}" = "x" ]; then \
       echo "ERROR: METVIEWER_GIT_NAME undefined! Rebuild with \"--build-arg METVIEWER_GIT_NAME={branch, tag, or hash}\""; \
       exit 1; \
-    else \
-      echo "Build Argument METVIEWER_GIT_NAME=${METVIEWER_GIT_NAME}"; \
     fi
 
 #
-# METCALCPY_GIT_NAME is required.
+# Use the develop branch for METviewer dependencies by default.
+# Use "--build-arg" options to override.
 #
-RUN if [ "x${METCALCPY_GIT_NAME}" = "x" ]; then \
-      echo "ERROR: METCALCPY_GIT_NAME undefined! Rebuild with \"--build-arg METCALCPY_GIT_NAME={branch, tag, or hash}\""; \
-      exit 1; \
-    else \
-      echo "Build Argument METCALCPY_GIT_NAME=${METCALCPY_GIT_NAME}"; \
-    fi
+ENV METVIEWER_REPO_DIR /METviewer
+ENV METPLOTPY_GIT_URL  https://github.com/dtcenter/METplotpy
+ENV METPLOTPY_GIT_NAME develop
+ENV METCALCPY_GIT_URL  https://github.com/dtcenter/METcalcpy
+ENV METCALCPY_GIT_NAME develop
+ENV METDATAIO_GIT_URL  https://github.com/dtcenter/METdataio
+ENV METDATAIO_GIT_NAME develop
 
-#
-# METPLOTPY_GIT_NAME is required.
-#
-RUN if [ "x${METPLOTPY_GIT_NAME}" = "x" ]; then \
-      echo "ERROR: METPLOTPY_GIT_NAME undefined! Rebuild with \"--build-arg METPLOTPY_GIT_NAME={branch, tag, or hash}\""; \
-      exit 1; \
-    else \
-      echo "Build Argument METPLOTPY_GIT_NAME=${METPLOTPY_GIT_NAME}"; \
-    fi
+RUN echo "Build Argument METVIEWER_GIT_NAME=${METVIEWER_GIT_NAME}"; \
+ && echo "Build Argument METPLOTPY_GIT_NAME=${METPLOTPY_GIT_NAME}"; \
+ && echo "Build Argument METCALCPY_GIT_NAME=${METCALCPY_GIT_NAME}"; \
+ && echo "Build Argument METDATAIO_GIT_NAME=${METDATAIO_GIT_NAME}";
 
 #
-# METDATAIO_GIT_NAME is required.
+# Constants
 #
-RUN if [ "x${METDATAIO_GIT_NAME}" = "x" ]; then \
-      echo "ERROR: METDATAIO_GIT_NAME undefined! Rebuild with \"--build-arg METDATAIO_GIT_NAME={branch, tag, or hash}\""; \
-      exit 1; \
-    else \
-      echo "Build Argument METDATAIO_GIT_NAME=${METDATAIO_GIT_NAME}"; \
-    fi
+ENV TOMCAT_MINOR_VERSION 5.61
+ENV TOMCAT_MAJOR_VERSION 8
+ENV TOMCAT_VERSION ${TOMCAT_MAJOR_VERSION}.${TOMCAT_MINOR_VERSION}
 
 #
 # Install system updates