U.S. Marines with 1st Battalion, 5th Marine Regiment, 1st Marine Division and CH-53E crew chiefs carry medical equipment during assault support tactics three (AST-3) at Kiwanis Park, Yuma, Ariz., April 17, 2015. The exercise is part of a seven-week training 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 photograph by Staff Sgt. Artur Shvartsberg, MAWTS-1 COMCAM/Released)