a Pentagon command and communications center for the National Command Authority (i.e., the President of the United States and the United States Secretary of Defense).

The Deep Underground Command Center, sometimes also called the Deep Underground Command and Control Site, was a United States military installation that was proposed on January 31, 1962, to be "a very deep underground center close to the Pentagon, perhaps 3,000–4,000 feet (914–1,219 meters) down, protected to withstand direct hits by high-yield weapons and endure about 30 days in a post-attack period."

The Combat Capabilities Development Command Soldier Center, formerly the United States Army Natick Soldier Research, Development and Engineering Center, is a military research complex and installation in Natick, Massachusetts, charged by the U.S. Department of Defense with the research and development (including fielding and sustainment) of food, clothing, shelters, airdrop systems, and other servicemember support items for the U.S. military.