Call to Quarters
Encyclopedia
Call to Quarters is a bugle call
Bugle call
A bugle call is a short tune, originating as a military signal announcing scheduled and certain non-scheduled events on a military installation, battlefield, or ship. Historically, bugles, drums, and other loud musical instruments were used for clear communication in the noise and confusion of a...

which signals all personnel not authorized to be absent to their quarters for the night.
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