ws | 305 DO tests might start one to two weeks earlier, depending on readiness and scheduling problems. Until this time 7.1 had to plan on both an assigned starting date of April 1, which seemed impractical and inefficient, and « recommended sterting date of lay 1. eo ending in we” March, 1958, and imposed a heavy edditional load on many Task Group, program and project personnel, By the summer and fall of 1956 the three services had decided on the shots they planned to sponsor for H.RDTACK and the major projects they . wanted to carry out. «After review and recommendations by (FSP, there emerge ed a program of five DOD shots which remained virtually unchanged throughout the operation. It consisted of cnc220 shot at 90,000 feet altieg tude; two underwater shots, Sne at the bottom of Eniwetok lagoon in about 150 feet of water, and one in nearby deep waiter in the open sea at a depth of 400 (later 500) feet; and two missile shots ofaaa Ss 250,000 feet and 100,000 (later 125,000) feet. By the time an informal Eniwetok Planning Boord with representatives of LASL, UCRL, Field Command AFSUP, Sandia Corporation, and Task Group 7.1 met at Los Alamos on January 31, 1957, the following LASL and UCRL shots, in addition to the five DOD shots, were being considered for Operation HiRD= TACK and served as a basis for discussion: Number of Shots L/SL: Yield range 1 6 2 1 2 UCRL: 4 4 %, Ly, 1 “he 4 Hethod of Liountin= barge barge Se oy” 9 surface barge or tower tower barge 1 surface, 3 barge tower or barge tower or barge tower 4,