iil 159 The Air Operations Center performed let~—down of all aircraft to VFR con=ditions on all recoveries because of a loss of precision radar by Ground Controlled Approach, UHKBHELLA. The second underwater shot of the HARDTACK series was UMBRELLA, detonated at a 150-foot depth on the lagoon side of HENRY Ise land, Eniwetok Atoll, at 1115 hours on 9 June 1958. duce a fi —e —n og Predicted to pro=- jeld, UMBRELLA wasER No postponements ee of tnis event occurred, y Twenty aircraft were originally scheduled, but 21 participated, No effects aircraft were engaged in tnis test,22 but four samplers took part .33 night suoport aircraft participated in post-shot project recovery opera- tions in and around the test array. One SA-16 (ST*BLE ECHO aborted because of an oil leak in the left engine; another SA-16 replaced the aborted aircraft. Both the Air Cperations Center and communications facilities per formed satisfactorily. mAPLE. near FOX Isl On lL June 1958 at 0530 nours, MAPLE was detonated on a barge » Bikini Atoll after two postponement s. ie weapon, a al had a predicted yield o/ Ten aircraft were scheduled, and 11 participated. One air abort oc- curred; a B-57 sampler aborted because of a flame~out, being replaced by a spare sircra.t. One effects aircraft?4 took part, as did eight samplers.?° Comuunications were excellent, and air control was satisfactory. The