(9) Beach; (lo) Communications Building; (11) Photo Tower (Aomon and Runit) (12) Causeway on Aomon/Biijiri; (13) Blast Building (2); (14) Blast Footings; (15) Blast Footing Common. Telephones had already been installed on the AV’S in Shops No. 1,2, 4,5, 6, 7, 8, 9, 10, 11, 12, and 15, Admiral’s Cabin and Flag Office. No further modification was therefore required. Coincident with the decision to employ shipboard radio telephone circuits between ships and shore was the formulation of a plan for VHF carrier teletype between the three primary ships and between AGC-7 and Eniwetok. The permanently installed HF radio teletype equipment would be used only to back up the VHF circuits and to provide communication with Hawaii during movementi to and from the forward area. It was decided to employ the one-time tape (SIGTOT) cryptographic system for classified message traffic between Atomic Energy Commission activities in the United States and the forward area. This decision was based on the fact that the Atomic Energy Commission appraved of and had been using SIGTOT; consequently, trained personnel and the necessary equipment were already available. SIGTOT would also provide one of the most secure means of transmitting classified information. Through conferences with Commander R. J. Schmidt of the Communication Section, Commander James Hargraves, Lieutenant J. M. Jones and Mr. John Kelly of the Department of the Navy, it was decided that three (3) SIGTOT equipments would be required on each AV and five (5) SIGTOT equipments on the AGC-7. This provided the necessary coding facilities for a three-way SIGTOT conference. One SIGTOT could be used to transmit to the other two ships and one SIGTOT used to receive from each of the other ships. The two remaining equipments on the AGC-7 could be used simultaneously to encode other messages while the conference was in progress. The Technical Net consisting of SCR-608’S installed at important stations within the task force was, until 28 October 1947, planned to be the primary intra-task force voice communication system. The decision to install AN/TRC–l radio telephone equipment on the three main ships reduced the Technical Net to a “back-up” status. The communication requirements of the photographic group were determined on 5 November 1947, and it was decided, that communications to the photo towers could best be supplied by their inclusion in this net. The final plan for the Technical Net called for the following stations: (1) AV-4 (2) AV-5 (3) AGC-7 (4) CVE-115 (5) (6) (7) (8) LSM-250 LSM-378 Boat Pool Base (LSD-19) LCM (6) Tank Control Boat 105 t: