model; XG-29G (44-84043) which served as a flying test bed for J-35, J-47 and J-73 jet engines mounted in the bomb bay; the YB-29H used for special armament testing; YB-29J used for services testing of improved engine designs; QB-29 target drones. The CB-29K was an experimental transport version. Air Defense Command Beginning in 1954, the 4754th Radar Evaluation Squadron, Air Defense Command operated B-29s from various bases in the United States to provide ECM training and evaluation services to its radar site personnel. The B-29s contained an assortment of RADAR jamming devices to provide the required training of personnel. 4754th Radar Evaluation Electronics Counter-Countermeasure Flight, Hamilton AFB, California 4677th Radar Evaluation Electronics Counter-Countermeasure Flight, Hill AFB, Utah 4713th Radar Evaluation Flight, Griffiss AFB, New York 6023d Radar Evaluation Squadron, Naha AB, Okinawa (attached to Pacific Air Forces) The last B-29 (a TB-29 radar evaluation aircraft, B-29-15-MO serial number 42-65234) was retired from the USAF inventory at 2010 hours on June 21, 1960, when Major Clarence C. Rarick of the 6023d Radar Evaluation Squadron landed at Naha Air Base, Okinawa, bringing the era of B-29 Superfortress military service to an end. United States Navy The United States Navy received four B-29s on April 14, 1947 and redesignated as P2B. Two of these aircraft were in standard configuration (P2B-1S), two another were equipped with test radar and additional fuel tank in bomb bay (P2B-2S). P2B-1S BuNo 84028 (B-29-95-BW 45-21789) P2B-1S BuNo 84029 (B-29-95-BW 45-21787) P2B-2S BuNo 84030 (B-29-95-BW 45-21791) P2B-2S BuNo 84031 (B-29-90-BW 44-87766) Naval B-29s were used as test beds and as mother ships in various programs. One P2B-1S was extensively modified to carry the Douglas D-558-II Skyrocket supersonic rocket-powered research aircraft. The first Skyrocket launch took place on September 8, 1950. The Skyrocket exceeded Mach 2 for the first time on November 20, 1953 (piloted by Scott Crossfield). The last Skyrocket flight took place in December 1956. P2B-1S BuNo 84029 was later transferred to NACA for continuation of high-speed flight tests and was redesignated as NACA-137. It was eventually sold to a civilian owner, a museum in Oakland, California. This was the only example of a flyable B-29 ever being sold to a civilian operator. This B-29 was flown on rare occasions under the civil registration N91329. After many years of inactivity, it was sold to the Kermit Weeks Aviation Museum of Miami, Florida. It was transported there disassembled in