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In the Navy and Marine Corp there are 11 General Orders of a Sentry, however there are an unofficial twelfth and thirteenth referred to by many.
RDC to Recruit: "What is the "13th General Order of a Sentry?"

Recruit to RDC: "To walk my beat, beat my meat, and fuck/shoot anything within 50 feet."
by Little Dickie January 03, 2009

Words related to 13th General Order of a Sentry

eleven general marine navy orders sentry thirteenth twelfth