delays. To improve circuit efficiency, it was decided to establish an electronic relay system of operation at Hawaii during those crit=ical periods when the direct circuit operation was not satisfactory. An electronic relay was necessary because of the on-line SIGTOTSAMSON crypto system emplcyed. TG 7.5 concurred in the proposal and USARPAC agreed to provide the electronic patch facilities and equipment. OCSigO-FAPUSJCEC (Frequency Allocation Panel, U. S. Joint Communications - Electronics Committee) was requested to provide a full complement of high frequencies for the operation of the circuit. Since it was not intended that the direct Eniwetok-Los Alamos circuit and the patch system would be operating at the same time, it was recommended that the same frequencies assigned to the direct circuit be used for the electronic patch system, After installaticn of the patch system, a continuous seven-day test showed that this system provided about twenty-two hours daily usable circuit time as compared to only six hours daily on the direct circuit. Az a resuit of this performance the electronic relay system was employed continuousiy for the remainder of Operation CASTLE. | Initially all the Bikini Atcll facilities providing inter-atol voise and teletype commmications ware located at Eninman sinze the bunker on Enyu which would eventually house this equipment had sct been completed at that tine. Oa 16 January 2954, ali TG 7.2 facii~ ities were moved to the bunker on Enya except for a. small commurication center retained on Enirman, Numerous operating diffisraities were experienced following the move to Enju for the space in the