Special-operations troops think the elite force is facing difficulties by accepting open gays into one of the military's more politically conservative communities. Interviews with current and former commandos reveal that to maintain unit cohesion of Army Green Berets, Navy SEALs or other elite covert warriors, the military services and U.S. Special Operations Command need to make a special effort to ensure both homosexuals and heterosexuals know the rules of conduct. "I'm unsure how the Defense Department will define 'openly gay,' " said one Green Beret officer. "I can envision all sorts of new regulations or changes to existing ones, class...