When you are on a military installation Reveille (originating from the French word to “wake up”) will be played first thing in the morning as the flag is being raised and Retreat will be played and the of the duty day when the flag is being lowered. If outside during these times civilians, including children, should stand silently and face the flag.
If you are in your vehicle when it is time for Reveille or Retreat and are on a military installation, stop your car and turn off your music. If you are on an Army post, you are expected to get out of your vehicle (even if it is in the middle of the road), stand and face the flag. Once you are out of your vehicle you are expected to act as though you were outside during the ceremony. However, this varies depending on the branch of the military. If you are on a Navy, Air Force or Marine base, you do not need to get out of your vehicle, just stop it and turn off the music, sit quietly and listen while the Retreat bugle is played.