The arrival of U.S. Special Forces trainers in this battered town last month signaled the beginning of a change that gives the United States more direct military involvement in Colombia’s long civil war and could lead the country’s two leftist guerrilla armies to broaden attacks against U.S. targets. Late last month, the smaller of the two Marxist-oriented guerrilla movements, the National Liberation Army, kidnapped two journalists, a Briton and an American, in this oil-rich region of eastern Colombia, saying the province had become a “war zone declared by the North American government and the Colombian state.” Full Story