7.26mm ball rounds are laid out in preparation for battle drills during Weapons and Tactics Instructor (WTI) Course 2-15 near Yuma, Ariz., April 4, 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, 2nd MAW Combat Camera/Released)