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KABUL, Afghanistan - Tennis greats Anna Kournikova and Nick Bollettieri arrive at the Kabul International Airport military compound Dec. 14. They visited the International Security Assistance Force Joint Command with a contingent of fellow celebrities who are embarking on the 2009 USO Holiday Troop Visit, which is touring across Afghanistan to raise the morale of deployed troops. The celebrities are traveling with U.S. Chairman of the Joint Chiefs of Staff Adm. Mike Mullen and his wife, Deborah Mullen. Billy Ray Cyrus and Dave Attell are also participating in the tour. (ISAF Joint Command photo by U.S. Air Force Tech. Sgt. Nathan Gallahan)