The bombing campaigns of the Vietnam War were the longest and heaviest aerial bombardment in history. The United States Air Force, the U. S. Navy, and U. S. Marine Corps aviation dropped 7,662,000 tons of explosives. By comparison, U. S. forces dropped a total of 2,150,000 tons of bombs in all theaters of World War II.
List of bombing campaigns
Farm Gate: 13 January 1962—January 1965
Operation Pierce Arrow: 5 August 1964
Operation Barrel Roll: 14 December 1964—29 March 1973
Operation Flaming Dart: 7 February 1965—24 February 1965
Operation Rolling Thunder: 2 March 1965—2 November 1968
Operation Steel Tiger: 3 April 1965—11 November 1968
Operation Arc Light: 18 June 1965—15 August 1973
Operation Tiger Hound: 5 December 1965—11 November 1968
Operation Commando Hunt: 11 November 1968—29 March 1972
Operation Niagara: January 1968—March 1968
Operation Menu (consisting of Operations Breakfast, Lunch, Snack, Dinner, Dessert, and Supper): 18 March 1969—26 May 1970
Operation Patio: 24 April 1970—29 April 1970.
Operation Freedom Deal: 19 May 1970—15 August 1973
Operation Linebacker I: 9 May 1972—23 October 1972
Operation Linebacker II: 18 December 1972—29 December 1972