resulted in decreased operating efficiency and poor utilization of both personnel and equipment. It was determined, therefore, that establishment of a permanent joint relay-crypto center on Eniwetok Island was a basic necessity for improvement of the overall communications system. Concurrently with the planning for expansion and re-design of the Eniwetok Relay—-Crypto Center, an investigation was conducted to determine methods and equipment required to process more rapidly large quantities of high precedence classified traffic and at the same time provide security analysis protection for unclassified traffic. After discussion of the preblem with the National Secu- rity Agency (NSA) they recommended the use of SIGTOT (PYTHON) crypto system used in conjunction with SAMSON synchronous mixing equipment operated on-line, Following the decision as to types of facilities to be utilized for the Operation, the network was established and the plan for routing traffic originated. It was planned to have sclentific traffic routed on-line to Los Alamcs and off-line SIGTOT, using commercial facilities, from Los Alamos to miscellarecus AEC and AEC contractor organizations. During the pre-:nct period, scien- tific traffic between Eniwetok and Bikini Atolls was handied over direct SIGTOT-SAMSON facilities with terminal teletype and radio equipment controlled by Edgerton, Germeshausen and Grier, Inc., (EG&G) personnel and crypto equipment contrcolied remotely by TG 7,2 personnel in the Parry Island and Bikini Atoll Communications Centers. 207