U.S. Marines with Marine Fighter Attack Squadron 121, 3rd Marine Aircraft Wing, conduct the first ever hot load on the F-35B Lightning II in support of Weapons and Tactics Instructor Course 1-17 at Marine Corps Air Station Yuma, Ariz., Sept. 22, 2016. The exercise is part of WTI 1-17, a seven-week training event hosted by Marine Aviation Weapons and Tactics Squadron One cadre. MAWTS-1 provides standardized tactical training and certification of unit instructor qualifications to support Marine Aviation Training and Readiness and assists in developing and employing aviation weapons and tactics. - U.S. Marines with Marine Fighter Attack Squadron 121, 3rd Marine Aircraft Wing, conduct the first ever hot load on the F-35B Lightning II in support of Weapons and Tactics Instructor Course 1-17 at Marine Corps Air Station Yuma, Ariz., Sept. 22, 2016. The exercise is part of WTI 1-17, a seven-week training event hosted by Marine Aviation Weapons and Tactics Squadron One cadre. MAWTS-1 provides standardized tactical training and certification of unit instructor qualifications to support Marine Aviation Training and Readiness and assists in developing and employing aviation weapons and tactics.