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Rear Adm. Randolph L. Mahr, deputy executive officer of the F-35 Joint Strike Fighter program, thanks members of the 76th Propulsion Maintenance Group’s F135 engine line for their hard work and dedication to completing maintenance modifications to the engine on target. The F135 engine powers the F-35 Lightning II, and in an announcement made on July 31 by the Marine Corps, operating capabilities began for the Marine Fighter Attack Squadron 121 in Yuma, Ariz. (Air Force photo by Kelly White/Released)