Tennis star and frequent USO participant Anna Kournikova speaks to a crowd of coalition force troops at the Kabul International Airport, Dec. 14. The Chairman of the Joint Chiefs of Staff, Adm. Mike Mullen and his wife, Deborah, accompanied Kournikova and other members of the USO's Chairman of the Joint Chiefs of Staff Holiday Troop Visit, on the flight into Kabul. The group will visit several locations in Afghanistan to bring holiday cheer and entertainment to the coalition forces.