CHAPTER |, SECTION 1 (Neg. No. W-V-238-9) Figure No. 1-5. IBM Equipment Installation — Building 453 — Elmer. plished by utilizing the existing vaults or constructing the new type. ~~ Under the supervision of the newly-created Communications Division, communications facilities at EPG were greatly expanded in preparation for the forthcoming Operation. The Tropo- was the IBM Building, an all-concrete structure with suspended ceilings and, in one room, a removable floor set on stringers on concrete pedestals. This building, which contained an air-conditioning system to provide both overhead and under-floor circulation, was started in Octo- spheric Scatter System and the Automatic Dial ber 1957 and was available for occupancy on 10 February 1958. The largest new Scientific Sta- service within Eniwetok Atoll and directly to Janet, started in*September 1957 and completed Exchange System provided automatic dialing the switchboard on Site Nan in Bikini Atoll. A military microwave system, a voice circuit to Kwajalein, a carrier system, and a commercial VHF System were also put into operation, thereby providing the more adequate and efficient communications facilities demanded by HARDTACK requirements. The use of radio interference detection equipment provided better control and radio discipline of radio circuits than was possible during REDWING. By far the most complex building constructed under the PAC program for HARDTACK Page 22 tion construction project was Station 1312 on in April 1958. Besides the buildings and other facilities contained in the over-all program, 788 Scientific Stations were required, of which 80 were considered of major size. Concurrent with construction planning, personnel requisitions were prepared and recruiting wasintensified to provide the personnel to Jobsite in the amounts necessary to accomplish H&N’s mission. A peak of 3158 contract employees at Jobsite was reached on 9 April 1958. With the arrival of other elements of the Task Force