used for training in bombardment missions and air refueling operations. 1st Combat Evaluation Group The 1st Combat Evaluation Group (1961–90) reporting directly to the Deputy Commander of Operations, Strategic Air Command Headquarters, Offutt AFB, Nebraska, to provide command level standardization/evaluation of SAC aircrews, radar scoring of simulated bombing activity by SAC aircraft; and contingency warfare support of ground directed bombing, with detachments in Southeast Asia during the Vietnam War. In 1990, part of the 1CEVG became the 99 Electronic Combat Range Group and was the 99th Range Group became part of the Nellis AFB 98th Range Wing in 1995. 2nd Bombardment Wing The 4238th Strategic Wing was phased out on 1 April 1963. The 2nd Bombardment Wing, Heavy was reassigned without equipment or personnel to Barksdale from Hunter AFB, Georgia. taking over the B-52 and KC-135 mission from the 4238th Strategic Wing. The aircraft and crews remained at the base, but the wing (and its bomb squadron) were given new designations, the 20th Bombardment Squadron and 913th Air Refueling Squadron. The 2nd Bomb Wing under various designations, has been the host unit at Barksdale for over 40 years. The 20th retained the B-52Fs until being transferred in June 1965 to the 7th Bomb Wing at Carswell AFB. It was replaced by the 62nd Bomb Squadron, which flew the B-52G which was reassigned from the inactivating 39th Bombardment Wing at Eglin AFB, Florida. A second "G" squadron, the 596th Bomb Squadron was reassigned to Barksdale in April 1968 from the 397th Bombardment Wing at Dow AFB, Maine. During the Vietnam War, the 2nd Bomb Wing deployed to Southeast Asia for "Arc Light" and "Young Tiger", including use B-52G in Linebacker I and Linebacker II raids of 1972 – 73 at the end of the war. In addition to the Motorola SST-181 X Band Beacon Transponder for Combat Skyspot, the B-52G had onboard ECM for protection against enemy surface-to-air missiles. In the latter stages of Linebacker II, some of the B-52Gs were diverted in-flight to targets deemed to be less dangerous. All aircraft and crews returned to Barksdale in January and October 1973. Post-Vietnam era From 1973–1992, Barksdale hosted the annual Strategic Air Command Bombing and Navigation Competition and awards symposium. After spending weeks dropping bombs on ranges throughout the United States and engaging in navigational competition, SAC's finest bomber and tanker aircrews gathered here for the score posting and awards presentation,