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A Marine with the Special Reaction Team fires an M16 during a sustainment training exercise in Charleston, S.C., Oct. 23. The SRT is a part of the Provost Marshal's Office and provides a quick-reaction force for extreme situations. - A Marine with the Special Reaction Team fires an M16 during a sustainment training exercise in Charleston, S.C., Oct. 23. The SRT is a part of the Provost Marshal's Office and provides a quick-reaction force for extreme situations.