The 3d U.S. Infantry Regiment (The Old Guard) is the oldest active infantry unit in the Army. Founded in 1784, it even predates the Constitution of the United States. Since 1948, The Old Guard has been stationed in the Washington, D.C., area at Joint Base Myer-Henderson Hall at Fort Myer, Virginia.

As a Military District of Washington unit, the 3d U.S. Infantry is charged with the unique mission of serving as the U.S. Army’s official ceremonial unit, performing tactical infantry missions whenever and wherever necessary and providing security for the nation’s capital.