Vietnam War: Viet Cong guerrillas attack the United States embassy in Saigon, and other attacks, in the early morning hours, later grouped together as the Tet Offensive.
The controversial musical Hair, a product of the hippie counter-culture and sexual revolution of the 1960s, opens at the Biltmore Theatre on Broadway, with some of its songs becoming anthems of the anti-Vietnam War movement.
Vietnam War: The United States Department of Defense announces that the U.S. Army and U.S. Marine Corps will send about 24,000 soldiers and Marines back to Vietnam for involuntary second tours of duty in the combat zone there.