"First Sergeant's Call" is a
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 ...
which signals that the
First Sergeant
First sergeant is typically a senior non-commissioned officer rank, used in many countries.
Singapore
First sergeant is a Specialist (Singapore), specialist in the Singapore Armed Forces. First sergeants are the most senior of the junior spe ...
is about to form the company.
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References
bands.army.mil
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Bugle calls