Marines with Marine Fighter Attack Squadron (VMFA) 121 “Green Knights,” conduct a maintenance check on an F-35B Lightning II on the flight line aboard Marine Corps Air Station Yuma, Arizona, Aug. 18, 2014. - Marines with Marine Fighter Attack Squadron (VMFA) 121 “Green Knights,” conduct a maintenance check on an F-35B Lightning II on the flight line aboard Marine Corps Air Station Yuma, Arizona, Aug. 18, 2014.

Marines from multiple units throughout the air station fire the M9 pistol during Security Augmentation Forces training aboard Marine Corps Air Station Miramar, Calif., May 1. The training was held over a 10-day period and covered the basics of law enforcement and use of force. - Marines from multiple units throughout the air station fire the M9 pistol during Security Augmentation Forces training aboard Marine Corps Air Station Miramar, Calif., May 1. The training was held over a 10-day period and covered the basics of law enforcement and use of force.