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A M16 A4 service rifle is broken down for an inspection and cleaning Aug. 9, 2018 at the Camp Foster armory, Okinawa, Japan. - A M16 A4 service rifle is broken down for an inspection and cleaning Aug. 9, 2018 at the Camp Foster armory, Okinawa, Japan. Small arms repair technicians maintain and repair weapons used by Marines. Without the proper maintenance small arms repair technicians conduct, the safety of the weapon, and the Marine operator, are at risk. (U.S. Marine Corps photo by Lance Cpl. Kelcey Seymour)