Irish rock star Bono (2nd L) of the supergroup U2 poses for a souvenir photograph December 31 with U.S. Army Sergeant John Kohne (L) of San Diego during a visit to an American NATO anti-artillery radar installation overlooking the Bosnian capital. Bono is on a private trip to the city. At right are Specialist Brandon Debinion of Glendora, California and Private First Class Jason Broz of Akron, Ohio