The 3d U.S. Infantry Regiment, traditionally known as "The Old Guard," is the oldest active-duty infantry unit in the #USArmy, serving our nation since 1784. The Old Guard is the Army's official ceremonial unit and escort to the president, and it also provides security for Washington, D.C., in time of national emergency or civil disturbance. The unit received its unique name from Gen. Winfield Scott during a victory parade at Mexico City in 1847 following its valorous performance in the Mexican