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A U.S. Marine Corps CH-53E Super Stallion and U.S. Army MH-60M Black Hawks assigned to Marine Corps Aviation Weapons and Tactics Squadron One (MAWTS-1) conduct an aerial refueling exercise in support of Weapons and Tactics Instructor course (WTI) 1-18 in Yuma, Ariz., Oct. 6, 2017. (Sgt. Allison Lotz/Marine Corps)