U.S. Marine Corps Staff Sgt. David E. Jefferson, a motor transport operations chief assigned to Marine Wing Support Squadron 271, secures straps to a crane during an aircraft salvage during Weapons and Tactics Instructor Course (WTI 2-15) at K-9 Village, Yuma Proving Grounds, Ariz., March 30, 2015. WTI is a seven-week event hosted by Marine Aviation Weapons and Tactics Squadron One (MAWTS-1), 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. Marine Corps photo by Lance Cpl. Jodson B. Graves 2d MAW Combat Camera/Released)