Marine Corps Gen. Joseph F. Dunford Jr., chairman of the Joint Chiefs of Staff, introduces the celebrities from the 2015 USO Holiday Troop Tour, Dec. 9, 2015, at Ramstein Air Base, Germany. Dunford accompanied the special guest during the USO’s annual troop tour that includes several stops to visit service members overseas. ( Air Force photo/Staff Sgt. Leslie Keopka)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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