It is the largest federal government reorganization since the Department of Defense was created via the National Security Act of 1947 ( as amended in 1949 ) .
HSA created the United States Department of Homeland Security and the new cabinet - level position of Secretary of Homeland Security .
HSA is the largest federal government reorganization since the Department of Defense was created via the National Security Act of 1947 ( as amended in 1949 ) .
HSA created the United States Department of Homeland Security and the new cabinet - level position of Secretary of Homeland Security .