U.S. Marine Corps Lance Cpl. Matthew H. Earl, an avaition ordanence technician assigned to Marine Light Attack Helicopter Squadron 167, signals all clear while disarming an AH-1Z Cobra during a forward arming and refueling point exercise during Weapons and Tactics Instructor Course (WTI 2-15) at Auxiliary Airfield 2 near Yuma, Ariz., March 30, 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)