News of this year

Pol Pot and Khmer Rouge take over Cambodia (April). 

The city of Saigon is surrendered and remaining Americans are evacuated, ending the Vietnam War (April 30). 

American merchant ship Mayaguez, seized by Cambodian forces, is rescued in operation by US Navy and Marines, 38 of whom are killed (May 15). 

Apollo and Soyuz spacecraft take off for US-Soviet link-up in space (July 15).