"First Call" is a bugle call with three distinct meanings. At a U.S. military installation it is a pre-reveille "courtesy" signal, sounded around 05:50, originally to assemble the trumpeteers to deliver the reveille that would be forthcoming at 06:00. Some locations also sound it a few minutes before retreat (lowering the flag at the end of the day). In other military contexts it may be used (e.g. 5 minutes) prior to sounding Assembly for any particular formation. Individuals who have not fallen in by the last note of Assembly may be considered late or AWOL. File:Bugle Calls First Call.svg