Chairman of the Joint Chiefs of Staff Adm. Mike Mullen, U.S. Navy, greets service members at Bagram Air Base, Afghanistan, on July 14, 2009. Mullen is accompanying a USO tour featuring Hall of Fame NFL coach Don Shula, NFL running back Warrick Dunn, actors Bradley Cooper and D.B. Sweeney and sports personality and model Leeann Tweeden on a visit to the Central Command area of responsibility.