U.S. Marines assigned to 1st Battalion, 5th Marine Regiment, 1st Marine Division, observe the battlefield from a rear position while participating in a heavy Huey raid during Weapons and Tactics Instructor Course (WTI) Course 2-15 at Auxiliary Airfield 2 near Yuma, Ariz., April 3, 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)