Air Force Chief of Staff Gen. Mark A. Welsh III receives a Prime Nuclear Airlift Force briefing from Capt. Art Dulin, 62nd Operations Support Squadron chief of readiness, left, and Tech. Sgt. Ben Messenger, 4th Airlift Squadron loadmaster, Feb. 3, 2014, at Joint Base Lewis-McChord, Wash. PNAF is a mission that is unique to the 4th AS, the only unit in the Air Force qualified to airlift nuclear materials. (U.S. Air Force photo/Tech. Sgt. Sean Tobin)
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