U.S. Marine Corps Capt. David Hirt, left, AH-1 instructor and Maj. Stephen Piantarnida, AH-1 instructor with Marine Aviation Weapons and Tactics Squadron One observe the terrain using night vision goggles during offensive air support exercise 5 in support of Weapons and Tactics Instructor course 2-17 at Chocolate Mountain Aerial Gunnery Range, Arizona, April 11, 2017. OAS is designed to focus on the integration of all air combat element aviation assets with a developed ground scheme of maneuver to conduct close air support. WTI is a seven-week training event hosted by MAWTS-1 cadre, which emphasizes operational integration of the six functions of Marine Corps aviation in support of a Marine Air Ground Task Force and 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.