May 2, 1964

1964Vietnam War: An explosion sinks the American aircraft carrier USNS Card while it is docked at Saigon. Two Viet Cong combat swimmers had placed explosives on the ship's hull. She is raised and returned to service less than seven months later.^[†]

The Vietnam War was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam and South Vietnam and their allies. North Vietnam was supported by the Soviet Union and China, while South Vietnam was supported by the United States and other anti-communist nations. The conflict was the second of the Indochina wars and a proxy war of the Cold War between the Soviet Union and US. The Vietnam War was one of the postcolonial wars of national liberation, a theater in the Cold War, and a civil war, with civil warfare a defining feature from the outset. Direct US military involvement escalated from 1965 until its withdrawal in 1973. The fighting spilled into the Laotian and Cambodian Civil Wars, which ended with all three countries becoming communist in 1975.

1964First ascent of Shishapangma, the fourteenth highest mountain in the world and the lowest of the Eight-thousanders.^[†]

In mountaineering and climbing, a first ascent, is the first successful documented climb to the top of a mountain or the top of a particular climbing route. Early 20th-century mountaineers and climbers focused on reaching the tops of iconic mountains and climbing routes by whatever means possible, often using considerable amounts of aid climbing, and/or with large expedition style support teams that laid "siege" to the climb.