forces in 1973. All B-52F missions in 1965 were against targets in South Vietnam (RVN) except for the December "...Duck Flight mission [that] hit a suspected VC supply storage area [for which] part of the target box was in Laos." In April 1966, Vietnam operations began with the B-52D model, a 1956 model designed to use the AGM-28 Hound Dog cruise missile and the ADM-20 Quail aerial decoys for low altitude operations and modified in late 1965 by Project Big Belly to increase conventional bomb capacity. SAC's RBS Squadrons were discontinued when most detachment personnel transferred to Vietnam from 1966 to 1973 for Combat Skyspot ground-directed bombing operations. The first "Quick Reaction" bombing was the "Pink Lady" mission on 6 July 1966 using SAC B-52D/Fs to support the U.S. Army's 1st Air Cavalry Division. The 1972 Operation Linebacker II also used Skyspot for Hanoi/Haiphong bombings in North Vietnam which resulted in the loss of 25 SAC aircrew members. By May 1967, SACADVON had moved to Seventh Air Force headquarters at Tan Son Nhut Air Base, South Vietnam to schedule and coordinate "...strikes for the 7th AF and MACV." From a level of 161,921 military and 20,215 civilian assigned to SAC in June 1968, SAC lost 13,698 first term airmen from November 1968 to May 1969 in a three phase drawdown known as Project 693 to comply with Public Law 90-364. While conventional bombing, air refueling and strategic air reconnaissance operations in Southeast Asia increasingly occupied SAC's operational commitments, SAC's primary mission of nuclear deterrence continued to remain its primary focus. In 1969, "...SAC's B-52s and B-58s could carry B28, B41, B43, B53, and BA53 nuclear weapons" (SAC had 311 nuclear AGM-28 Hound Dog missiles at the end of the year.) This also coincided with the B-58 Hustler's in-progress retirement from SAC's active inventory and its replacement with the FB-111. On 18 March 1969, along the South Vietnamese border, SAC first bombed Cambodia (Operation Menu through 26 May 1970 was controlled by Skyspot). On 17 February 1970, SAC conducted the first "GOOD LOOK" bombing of Laos at the Plaine des Jarres after B-52 photorecon missions ("GOOD LOOK ALPHA" in August 1969 and "GOOD LOOK BRAVO" ) and the observations of a Skyspot installation in Thailand. SAC transferred "...HQ 8th AF...to Andersen AFB, Guam on 1 April 1970 to oversee B-52D/G operations and to complement SACADVON". 8th AF took over from Third