U.S. Marine Corps Cpl. Erik C. Valencia, right, an F-35B fixed-wing aircraft mechanic with Marine Fighter Attack Squadron 121 (VMFA-121), 3rd Marine Aircraft Wing, observes the first-ever hot load on the F-35B Lightning II in support of Weapons and Tactics Instructor Course (WTI) 1-17 at Marine Corps Air Station Yuma, …
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