The end came faster than almost anyone predicted. The Paris Peace Accords of January 1973 had left a South Vietnamese government in place, sustained by American aid and the understanding—never formalized—that the United States would intervene if the North violated the agreement. Congress cut military aid to South Vietnam and passed the War Powers Resolution limiting presidential ability to commit forces. When North Vietnam tested the accords with probing attacks in 1974, there was no American response.
The Final Offensive
Hanoi's General Van Tien Dung launched his final offensive on March 10, 1975, attacking Ban Me Thuot in the Central Highlands. The South Vietnamese response—a strategic withdrawal from northern provinces—became a catastrophic rout. Retreating columns were ambushed; ARVN units dissolved as soldiers went to find their families. Hue fell March 25. Da Nang fell March 29. The speed of collapse surprised even the North Vietnamese—Dung had planned for a two-year campaign; it was over in seven weeks.
The Evacuation
Operation Frequent Wind, the US evacuation of Saigon, began April 29 when North Vietnamese artillery struck Tan Son Nhut airbase, ending fixed-wing evacuation. Over 19 hours, 70 US helicopters flew 630 sorties from the US Embassy and the DAO compound, evacuating approximately 1,373 Americans and 5,595 South Vietnamese. Thousands more South Vietnamese who had worked with the United States were left behind.
The Reckoning
The fall of Saigon ended an American military involvement that had cost 58,220 American lives and approximately 250,000 South Vietnamese military dead. The strategic consequences of 'losing' Southeast Asia proved less catastrophic than the domino theory had predicted. The psychological consequences for American military culture and public trust in military institutions lasted decades.