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U.S. Marines with Marine Fighter Attack Squadron (VMFA) 121’s seat shop, work on removing a canopy from an F-35B Lightning II aircraft at Marine Corps Air Station Iwakuni, Japan, Aug. 4, 2017. The squadron’s seat shop Marines are responsible for egress systems and environmental controls and oxygen systems within the F-35B Lightning II. Ensuring proper operating systems within their area of operation keeps aircraft in the air and has the potential of saving pilots’ lives.