U.S. Marine Corps AH-1Z Cobra helicopters await refueling during Final Exercise 1 of Weapons and Tactics Instructor (WTI) course 1-15 at Sandhill, Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Oct. 14, 2014. WTI is a seven week training event hosted by Marine Aviation and Weapon Tactics Squadron (MAWTS-1) cadre. MAWTS-1 provides standardized advanced 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 Cpl. Allison J. Herman, COMCAM/Released)