U.S. Marines assigned to 1st Battalion, 5th Marine Regiment, 1st Marine Division, prepare to board a CH-53E Super Stallion helicopter during FINEX-1 while supporting the Weapons and Tactics Instructor (WTI) Course at Marine Corps Air Station Yuma, Ariz., April 21, 2015. WTI is 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 photo by Lance Cpl. Travis Jordan, 3rd MAW Combat Camera/Released)