U.S. Marine Corps Gunnery Sgt. David Shaffer, center left, assigned to India Company, 3rd Battalion, 6th Marine Regiment, 2nd Marine Division, fast-ropes out of a UH-1Y Venom helicopter during a mock helicopter raid at Yuma Proving Ground, Ariz., April 9, 2014, as part of Weapons and Tactics Instructor Course 2-14. The Weapons and Tactics Instructor Course, 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.