1975 Chronology Of Cambodia History in Pol Pot Regime Jan. 1, 1975 Khmer Rouge launches final offensive against the capital, Phnom Penh. Jan. 11, 1975 US steps up airlift to Phnom Penh in light of increased insurgent attacks on the Mekong River town of Neak Luong. Jan. 14, 1975 Khmer Republic and the US exchanged [...]