2014 Event Two former Khmer Rouge leaders, Khieu Samphan and Nuon Chea, have been convicted of war crimes during the period of Cambodian genocide in the 1970s; a U.N.-supported war crimes tribunal sentenced the two men to life in prison; both men are in their 80s 1975 Event U.S. forces raid Cambodian island of Koh Tang to free Mayaguez ship 1975 Event U.S. merchant ship Mayaguez seized by Cambodian forces 1975 Event Cambodian Red Khmer occupy Phnom Penh 1969 Event U.S. B-52's drop 3,000 ton bombs at Cambodian boundary 1967 Event 25,000 U.S. and South Vietnamese troops launched Operation Junction City, offensive to smash Viet Cong stronghold near Cambodian border 1953 Birthday Norodom Sihamoni, Cambodian Royalty 1952 Birthday Hun Sen, born in Peam Koh Sna, Cambodia, politician, Cambodian People's Party, Prime minister of Cambodia, governed since the 1979 overthrow of the Khmer Rouge