This work examines the practice of air interdiction in three wars: World War II, the Korean War, and the war in Southeast Asia or Vietnam War. It considers eleven important interdiction campaigns, all of them American or Anglo-American, for only the United States and Great Britain had the resources to conduct interdiction campaigns on a large scale in World War II. Mark proposes a realistic objective for interdiction - preventing me, equipment and supplies from reaching the combat area when the enemy needs them and in the quantity he requires. Center for Air Force History, Washington, D.C.