US or U.S. usually refers to the United States of America. It may also refer to:
The United States Marine Corps (USMC) is a branch of the United States armed forces responsible for providing force projection from the sea, using the mobility of the United ...
The United States Navy (USN) is the sea branch of the U.S. Armed Forces. It is one of the seven uniformed services of the United States. As of 31 December 2008, the U.S. Navy had ...
The United States Air Force (USAF) is the aerial warfare, space warfare, and cyberwarfare branch of the U.S. armed forces and one of the American uniformed services.