them to divert a multitude of assets to keep the Ho Chi Minh Trail in serviceable condition, however airpower was never able to completely close the trail during the war. References Sources Littauer, Raphael and Normon Uphoff, eds, The Air War in Indochina. Boston: Beacon Press, 1972. Conflicts in 1965 Conflicts in 1966 Conflicts in 1967 Conflicts in 1968 Steel Tiger Steel Tiger Steel Tiger Steel Tiger 1965 in Vietnam 1966 in Vietnam 1967 in Vietnam 1968 in Vietnam United States Marine Corps in the Vietnam War Laos–United States relations Laotian Civil War Aerial operations and battles of the Vietnam War