| wm 2-45A Radio command and monitoring of the system was accomplished from a trailer van control station located aboard the USS Boxer. The EG&G timing system was utilized to initiate the arm and fire sequence. After five proof-test flights during HARDTACK, the YUCCA system was launched on 28 April 1958 at 1125 hours from tne flight deck of the USS Boxer at 164°, 30' E Longitude and 11°, k5' N Latitude. At launch plus 8 minutes, altitude 7,000 feet, the five instrument cannisters were deployed by radio command, and at launch plus 13 minutes, 12,000 feet, the YUCCA device was reel-deployed by radio command. The balioon borne system reached a floating altitude of 86,000 feet at launch plus 88 minutes. Later a dealy was requested by TG 7.4. YUCCA was detonatedby radio command at H-hour Prime, 1440 hours, at 12°, 37' N Latitude and 163°, 01.5'E Longitude. The yield for YUCCA, estimated from the history rs firings, was given by R. E. Watt, Last, as aga The only major operational problem encountered during the test was caused by radio interference with the fuzing command system. After all un- necessary radio circuits below 300 mc. were closed down, all interference disappeared. 2.4.2.3 Project 34.3. ‘ The objective of Project 34,3 was to procure, assembly, and eheck out the devices for the two underwater detonations, WAHOO and UMBRELLA, sponsored by the DOD. Procurement of the needed parts included the design and purchase of the water-tight device cases, the underwater signal cables, and the necessary firing and assembly equipment. Electri- cal equipment for both checkout and firing was purchased as regula: (4 Megs SD PAGE =,