U.S. Marines with Marine Fighter Attack Squadron 121

U.S. Marines with Marine Fighter Attack Squadron 121 load ordnance on a F-35B Lightning II while conducting a hotload during Weapons and Tactics Instructor Course (WTI) 1-18 in Yuma, AZ, on Sept. 21, 2017. WTI is a seven week training event hosted by Marine Aviation Weapons and Tactics Squadron (MAWTS-1) cadre which emphasizes operational integration of the six functions of Marine Corps Aviation in support of a Marine Air Ground Task Force. MAWTS-1 provides standardized advanced 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. Marine Corps photo by Lance Cpl. Koby I. Saunders)