What is The National Museum of United States?

Department of Defense:

Air Force:
Air Force Armament Museum
Air Mobility Command Museum
National Museum of the United States Air Force
Museum of Aviation
Strategic Air and Space Museum

Army:
National Museum of Health and Medicine
National Museum of the United States Army

Navy:
National Museum of the Marine Corps
National Museum of the United States Navy
National Naval Aviation Museum
National Navy UDT-SEAL Museum
Naval War College Museum
Submarine Force Library and Museum

Others:
National Museum of the American Indian
National Museum of American History