or ashore introduced delay in planning and executing this scientific construction program. Late receipt of structural criteria on numerous structures complicated an already strenuous schedule for design, procurement of materials and equipment, shipment to the Jobsite, and construction. In September of 1953, an inspec- tion of the status of progress of construction and scientific programs resulted in a decision to defer the date of the first detonation of the series from approximately 15 February 1954 to about 1 March. There was no postponement or delay of any test in the series due to non-availability on schedule of TG 7.5 structures or support services. PART 4, ENGINEERING AND CONSTRUCTION OF TEMPORARY FACILITIES GENERAL, The Field Manager, Eniwetok Field Office, U. S. Atomic Energy Commission, authorized Holmes & Narver, Inc. by letter dated 12 June 1952, to make a preliminary reconnaissance and study of Bikini Atoll to determine the possibility of its use as an auxiliary proving ground, and to report their findings. The study was based on the assumption that Bikini Atoll might be used for one or more detonations in a future operation. The report "Auxiliary Proving Ground, Marshall Islands" was submitted to the Field Manager, Eniwetok Field Office, on 2 August 1952. This re- port was based on existing charts, photographs, aerial reconnaissence of the area, and information obtained from people familiar with the Atoll. Copteg /Do, LANL, Lone -7T -