marked, and monitored, and infarme4 JTF SEVEN of the Icad and estimated time of departire of the aircraft. Each Flyavwery aireralt wis assiy. ba Sitjyie Proj ct Ofieer, who-w respes sibility was the delivery of each san.pie toa repvcsentative of the leburatury cuncerid, although most projects had monitors aboard as well. A message was dispatched to each labo- ratory having samples aboard, givirz estimated time of arrival of the aircraft so that the represcatative could meetthealecriftandassume custocy of thesimples. —: l ! Lo [Flyaways 3 and 4 also carried samples for thes+ laboratories and for NRDL ardChem!cal ard Racioloyical Laboratories as well. The sample-rcturn program was successful, performing its furction on schedule and without mishap. The number of aircraft assigned and the numer of fiignts scheduled weve both ample to meet the needs of the experimenters. 3.13 COMMUNICATIONS The communications mizsion of TG 7.1 was a3 follows: 1. To procure, install, operate, and maintain special electronic and communications equipmeat required by the Scientific Task Group. 2. To initiate voice time broadcasts for all elements of JTF SEVEN. 3. To coordinate the processing of TG 7.1 messages with responsible agencies. Task Group requirements in the PPG for timing signals, radio teletype service, and com- mercial type radio equipment were the responsibility of EG&G, and the requirements for mili- | tary type radio equipment and telephone and bucy cable systenois were the responsibility of TG 7.5, HEN. The AEC Communications Facility at Los Alamos was assigned the mission of operating the Los Alamos Terminal of the Eniwetok—Los Alamos RATT circuit and providing communications support of TG 7,1 Headquarters, Los Alamos. One cryptographic security officer and one enlisted assistant, attached to TG 7.1, were assigned at the AEC Communications Facility, Los Alazios, to handle messages encrypted in military cryptographic systesis. CTG 7,2 maintained and operated the Eniwetok terminal of the Eniwetok—Los Alamos RATY circuit, CITF SEVEN and H&N maintained and operated teletype stations on Parry connected with the Eniwetok terminal, The planning for communications facilities and services was based largely on the requirements submitted by the various projects of the Task Group in their monthly status reports. During this period close Naison was maintained with the J-5 Section of JTF SEVEN, EG&G, ard the Communications Sections of the other Task Groups. In this way requests for services could be consolidated and frequency assignments coordinated. Two trips were made to the PPG by the Task Force Comraunicators in April and November 1953 to plan communications equipment installation, view site locations, and meet operating personnel. The Task Force commandship, USS Estes (AGC-12), was visited in San Diego on September 21, and plans were made for the allocation of space and the installation of new equipment. On October 27, TG 7.4 conducted Operation Tigercat off the West Coast. This was a rehearsal, both to shakedown the Estes communications system and to provide a mock shot-time air operation. The initial Electronics and Communications Plan for TG 7.1 was submitted to JTF SEVEN in August of 1953, and the final plan was included in the Task Group Operation Plan No. 1-53, submitted in Decemberof 1953. , The Communications Section of TG 7.1 set up operations at the PPG during the first week of January 1954. Some scattered installations of telephones and radios as outlined in requirements to EG&G and TG 7.5 had taken place prior to this time. By January 20 the TG 7.1 RATT and HF voice circuits between Eniwetok and Bikini Atolls were in service, together with 80 per cent of the required radios and telephones. The Bikini Contol Point (CP) and all remaining communications circuits for the Task Group were in operation by early February. 51