The troops are trying to recover four military personnel who went missing in an ambush on the outskirts of the Haitian capital Port-au-Prince. El Salvador troops to support rescue mission to find four UN-backed soldiers who disappeared after ambush. By Harold Isaac and Gerardo Arbaiza PORT-AU-PRINCE/SAN SALVADOR, Oct 28 (Reuters) - El Salvador will send over 2,000 soldiers to Haiti to rescue missing personnel and support anti-gang.