Bridge during the operation. TWO SCR-62L vI& radio sets were installed in the Air operationsROOm for the purpose Of llWlitoX’i~all VHF cbels in we and as a standby for the shipboard VHF equipment. An additional remete control unit in the Air ~rations Room was Comected to the Kwajalein voice radio equipment for the purpose of using this facility for pasaing aircraft take-off times from Kwajalein. Peter Xray Day was a scheduled rehearsal for Xray Day. During this rehearsal all Air Force communicationsfunctioned to the satisfaction of the Commander Air Forces ad the Commander Air Task Group 7.4. However, the flagship was unable to make VHF contact with two PBM (Navy seaplae) sir-sea rescue aircraft. These aircraft were at a distance of twenty-fivemiles at 1500 feet from the USS HT. MCKINLEY. Direct VHF cawmnications were establishedwith only one other air-sea rescue plane, but indirect contact with all air-sea rescue planes was =de possible by using tlm Task Group 7.4 Cmmad relay. The cause of this difficulty was never satisfactorilydetermined. On XrW Dw, Dur& Aircraft as a contact with all drcraft was established and maintained. the period of H-hour minus ten (10) minutes to H-hour, severe fding of the AN/CPN-6 radar beacon on the Zero Island was noticed by all aircraft. Thle was later foumi to