, 20 III side-on positions, 2 On 18 March, the B-52, after being specially instrumented at the boeing Aircraft plant at Seattle for HARDTACK participation, departed from the Boeing site. After several days of delay at Hickam jir Force Base, because of adjustment and maintenance problems, the aircraft arrived at Eniwetok on 31 March and was prepared for test activity. The B52 engaged in several rehearsals and practices and 14 shots, and departed from Eniwetok to the Zone of Interior on 15 July 1958, concluding the activities of the Air Force Effects clement, A third element of the Test Aircraft Unit was the Navy bffects xlement, manned, trained, and equipped by Naval Air Special seapons Facility, Kirtland Air Force Base, New Mexico. The element operated two FJ4, two A4D, and one P2V aircraft in support of Bureau of Aeronautics projects, The element also provided, maintained, and operated M-33 radars for precise positioning of Navy effects aircraft in the Eniwetok area, The P2V departed from Kirtland jir Force Base on 25 January 1958 and arrived at kniwetok on 11 March, The fighter aircraft, ail of short range characteristics, left Kirtland on 10 March for Alameda Naval Air Station California, where they were prepared for shipment to sni- wetok, They arrived at sniwetok on 2 April 1958. Much of the supsly burden of Task Group 7.4 was aileviated by ar rangements of the Navy effects siement to draw most of its maintenance AFWL/ HO