3.16 SECURITY When JTF 132 was activated in August 1951, the Security Section of the Scientific Task Group continued in the same capacity as in Operation Greenhouse as the AEC-NME Test Se- curity Branch, SFOO. In November 1951 the Eniwetok Field Office was established by SFOO and was assigned the responsibility for AEC security at the Pacific Proving Grounds. In January 1952 the AEC-NME Test Security Branch, SFOO was converted into the Security Branch, Eniwetok Field Office. The branch was established when the Chief and one security assistant of the AEC-NME Test Security Branch were transferred to the Eniwetok Field Office Security Branch. In February 1952 two other assistants were assigned to the Eniwetok Field Office, and a military deputy, J-2 Section, was assigned to TG 132.1, Los Alamos. The security program associated with the construction phase of Operation Ivy at the Pacific Proving Grounds was under the direction of the Security Branch, Eniwetok Field Of- fice. In this connection it was necessary from December 1951 to November 1952 to secure 1482 Q clearances for employees of HEN. The Los Angeles AEC Security Branch was responsible for the actual processing and granting of the Q clearances for H&N personnel. It was also necessary for the Manager, SFOO,to grant five Q clearances to personnel of H&N in critical job categories. For the information of JTF 132 and for the operations of TG 132.1, it was necessary to maintain a clearance roster of all personnel of the Scientific Task Group (approximately 2500, including H&N) who participated in Operation Ivy. It was necessary in June 1952 to establish visitor security controls as required by AEC security regulations for visits to the Pacific Proving Grounds. This procedure enabled the Resident Engineer to become cognizantof anticipated visits and any requirements of the visie tors for contractor services. A security indoctrination letter was prepared and issued by the Commander, TG 132.1 to all personnel of the Task Group in August 1952 to comply with JTF Security Letter No. 6. This letter outlined the security responsibilities of all TG 132.1 personnel assigned to Operation Ivy. Security lectures were given to all TG 132.1 personnel by members of the J-2 Section upon their arrival at the Pacific Proving Grounds. The lecture included a brief description of the Ivy Identification System; the reporting of any suspicion of sabotage, espionage, and seditious and subversive activities; censorship; and a brief security indoctrination on local security regulations. In accordance with a JTF 132 directive, all personnel leaving the Pacific Proving Grounds after 12 November 1952 were required to sign a certificate stating that they would not disclose information to unauthorized persons. The Security Section established AEC facilities for the transmission of Top Secret messages between the Pacific Proving Grounds, the Los Alamos Field Office, and Washington. This was accomplished through the cooperation of SFOO communications. It was necessary to establish document channels for the dissemination of Restricted Data to DOD and DOD contractor participants through cleared DOD channels to the various facilities concerned. Nine military cryptographic clearances were obtained for personnel of the Los Alamos Field Office and SFOO to facilitate the handling of JTF 132 teletype traffic at Los Alamos and Eniwetok for AEC and AEC contractor purposes. To expedite the mail channels to the Pacific Proving Grounds from Albuquerque, a mailpouch system from Honolulu to Eniwetok was established for transmittal of material up to and including Secret Non-Restricted Data with the approval of AEC, Washington. This service was extended to TG 132.1 in August 1952. It was necessary to notify the State Department of the departure and arrival of U. S.citizens from and to the ZI because DOD AGO cards wereutilized by JTF 132 in lieu of passports. The designations of classified areas, the identification system, and guarding requirements were established through coordination of the Security Section, J-2 Section, JTF 132, and the scientific operating personnel of TG 132.1 during the period from August 1951 to July 1952. 45