In the U. S. military, Reveille is generally played at 7 A. M. as the morning bugle call. It was originally conducted in 1811 as Troop, and was designed to muster the unit or for roll call, but later came to mark when the flag was raised in the morning and honors paid to it. Played as a Military Trumpet Wakeup Call Army Cadence , bugle, call, wakeup