Airmen, Sailors, and Civilians patrol the waterways
Staff Sgt. John Sweeney, 628th Security Forces Squadron Harbor Patrol Unit, demonstrates aiming an M240 machine gun while on patrol Aug. 15, 2012, at Joint Base Charleston - Weapons Station, S.C. The M240 has a weight of 27.6 lbs., a maximum effective range of 1,800 meters area target and 800 meters point target. The M240 can shoot from 200 to 600 rounds-per-minute. Officers from the Harbor Patrol Unit must be qualified on the M240 and the M60 machine gun. (U.S. Air Force photo/Airman 1st Class Ashlee Galloway)