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A Marine with the Air Station's Special Reaction Team puts rounds down range during an exercise designed to familiarize SRT with the M45 1911 A1 pistol. The M45 1911 A1 pistol is slowly becoming the Marine Corps' standard-issue side arm, replacing the Beretta M9A1 service pistol which has been issued since 1990. - A Marine with the Air Station's Special Reaction Team puts rounds down range during an exercise designed to familiarize SRT with the M45 1911 A1 pistol. The M45 1911 A1 pistol is slowly becoming the Marine Corps' standard-issue side arm, replacing the Beretta M9A1 service pistol which has been issued since 1990.