U.S. Marine Corps Gunnery Sgt. David Shaffer, with India Company, 3rd Battalion, 6th Marine Regiment, 2nd Marine Division, prepares to fast-rope out of a UH-1Y Iroquois helicopter during a heavy Huey raid in Yuma, Ariz., April 9, 2014, during Weapons and Tactics Instructor (WTI) Course 2-14. The WTI, hosted by Marine Aviation Weapons and Tactics Squadron (MAWTS) 1, is designed to teach the six functions of Marine Corps aviation while providing the closest experience to real combat strategy, tactics and execution.