event that SAC headquarters was destroyed in a Soviet first strike. SAC's airborne alerts during this period also included Operation Chrome Dome for the bomber and tanker force. Although ostensibly a peacetime mission, Chrome Dome placed heavy demands on flight crews and five B-52 aircraft were lost to airborne mishaps during the operation's eight-year period. On 11 May 1961, SAC took delivery of its first B-58 Hustler supersonic medium bomber, assigning it to the 305th Bombardment Wing at Bunker Hill AFB. Optimized for high-altitude, high-speed penetration into Soviet territory prior to Soviet advancements in high-altitude surface-to-air missiles, the B-58 was expensive to operate and inefficient at lower altitudes. Its service in SAC would be comparatively short, eventually being replaced by the FB-111 by 1970. After an early 1961 development by SAC of a Radar Bomb Scoring (RBS) field kit for use in the U.S. Army's Nike surface-to-air missile systems, SAC aircraft flew several mock penetrations into Air Defense Command sectors in the 1961 SAGE/Missile Master test program, as well as the joint SAC-NORAD Sky Shield II exercise followed by Sky Shield III on 2 September 1962. In 1961, following the Berlin Crisis, President John F. Kennedy increased the number of SAC aircraft on alert to 50 percent and during periods of increased tensions SAC kept some B-52 airborne in the event of a surprise attack. In 1962, SAC gained full control of the various "Q Areas" developed by Sandia Laboratories for nuclear weapon storage adjacent to Loring AFB (Site E (Maine)/Caribou AFS), Ellsworth AFB (Site F (South Dakota)/Rushmore AFS), Fairchild AFB (Site G (Washington)/Deep Creek AFS), Travis AFB (Site H (California)/Fairfield AFS), and Westover AFB (Site I (Massachusetts)/Stony Brook AFS). These adjunct sites were subsequently converted to USAF-operated and maintained weapon storage areas (WSAs) in the same manner as WSAs on other SAC bases. The solid fuel LGM-30A Minuteman I was first deployed in 1962 and the LGM-25C Titan II reached operational service in 1963. Project Added Effort phased out all first-generation ICBMs beginning on 1 May 1964 when Atlas-D were taken off alert at Vandenberg AFB's 576th SMS (LGM-30F Minuteman II replaced Minuteman I in 1965). In October 1962, an SAC BRASS KNOB mission U-2 piloted by Major Richard S. Heyser detected Soviet intermediate range ballistic missiles in Cuba. BRASS KNOB operations involving multiple U-2 aircraft were subsequently commenced at a forward operating location at McCoy AFB, Florida the