U.S. Marine Corps Cpl. Haelyn Holden, a crew chief

U.S. Marine Corps Cpl. Haelyn Holden, a crew chief with Marine Heavy Helicopter Squadron 464, gives a class on a CH-53E Super Stallion during Weapons Tactics Instructors course (WTI) 1-18 at Yuma, Ariz., Sept. 16, 2017. WTI is a seven-week training even hosted by Marine Aviation Weapons and Tactics Squadron One (MAWTS-1) cadre, which emphasizes operational integration of the six functions of Marine Corps aviation in support of a Marine Air Ground Task Force and provides standardized advance 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 taken by Lance Cpl. Rhita Daniel)