Celebrities entertain U.S. troops in Gulf LOS ANGELES, June 19 (Reuters) - Celebrities ranging from Kid Rock to Wayne Newton are performing for U.S. troops in the Gulf this week as part of the first large-scale entertainment tour of the region since the outset of the Iraq war, sponsors said on Thursday. Three groups of performers and athletes taking part in the tour paid visits on Thursday to American military personnel in Baghdad, the aircraft carrier USS Nimitz and the Ali al-Salem air base in Kuwait, said Donna St. John, a spokeswoman for USO World Headquarters in Washington. On Wednesday,...