U.S. Marine Corps Sgt. Chrstopher B. McClellan, a crewmaster

U.S. Marine Corps Sgt. Chrstopher B. McClellan, a crewmaster assigned to Marine Aerial Refueler Transport Squadron 252, prepares to open the rear ramp of a KC-130J Hercules during an air delivery during Weapons and Tactics Instructor Course (WTI 2-15) at Auxiliary Airfield 2 near Yuma, Ariz., April 1, 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)