CHEYENNE - The Peacekeeper nuclear missile, credited by some with helping with the demise of the Soviet Union and winning the Cold War, is to be officially deactivated. F.E. Warren Air Force Base here oversaw the only squadron of 50 Peacekeepers deployed in the United States. Each 71-foot-tall, 8-foot-diameter missile, deployed in the 1980s, carried 10 warheads. Almost 15 years after the end of the Soviet Union and the Cold War, the last Peacekeeper, also known as the MX, has been removed from its hardened silo. A ceremony was scheduled Monday at F.E. Warren to mark the deactivation of the...