Before Reveille/Retreat, be sure to turn on the audio of the player/receiver.  It is located in in the navy conference room at the end of the hall. Turn both sound systems on, then select Disc 4 on the bottom sound system.  The first track is Reveille, and the second track is Retreat.  To switch tracks, use the knob to the very right on the bottom sound system.  There is a two minute delay before the music begins to play, in which time the detail should go outside, line up, and fall in.