 Complete the following phrase:  In 1965, Eighth Air Force entered combat again, this time in Southeast Asia. At first, the Eighth deployed its B-52 bomber and KC-135 tanker units from the U.S. to operating bases in Guam, Okinawa and Thailand. Then in April 1970, SAC moved the Eighth without personnel or equipment to Andersen AFB Guam, absorbing resources of the 3d Air Division. At Andersen AFB, the Eighth took over the direction of all bombing and refueling operations in Southeast Asia. The intensive bombing of Hanoi and Haiphong during 11 days in December 1972, known as 