Drill Call
Encyclopedia
Drill Call 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 sounds as a warning to turn out for Drill
Drill (disambiguation)
A drill is a tool or machine for cutting holes in a material.Drill may also refer to:Military:* The movements performed on a military parade* Former name of the United States Army Reserve's weekend assembly...

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