An MV-22B Osprey with Marine Medium Tiltrotor Squadron 163, Marine Aircraft Group 16, 3rd Marine Aircraft Wing, approaches a refueling hose during an aerial refueling training exercise as part of Weapons and Tactics Instructor course aboard Marine Corps Air Station Yuma, Ariz., April 8, 2015. Aerial refueling mitigates the need for aircraft to land for refueling, giving units more time for mission accomplishment. WTI is a seven-week exercise sponsored by Marine Air Weapons and Tactics Squadron 1 designed to provide advanced tactical training scenarios for fleet Marine force units and their sponsored WTI candidates.