Share this article1.6K      1.6KShares Air Force Security Police and South Vietnamese soldiers guard the perimeter fence at Tan Son Nhut Air Base. Vietnam The aerial interdiction campaign against North Vietnam which began on 6 April 1972 with attacks in the southern part of the country expanded rapidly. On 16 April, B-52s, escorted by fighter and aircraft … Continue reading B-52s Over Hanoi, 1972 – Operation Linebacker and the Christmas Bombing