Thus, there will be at least four types of positioning, with each type presenting different requiremenis for instrumentation. Air-to-Air Rocket ~ The air-to-air rocket shot will be an effects experiment designed to test certain important facts of a known warhead at a. stated distance. It will not be a proof test or demonstration. The safety of such an experiment was considered at great length before the test was scheduled in Nevada. Possible effects were considered such as the maximum range of missiles, the possibility of non—-detonation at the prescribed point and the possible consequences of non-firing, and the need to obtain important experimental data on the performance of -the missile system, It was decided that the technical data required could be obtained and safety considerations could be satisfied by detonating the missile at a prescribed position in space rather than by using a drone aircraft or a towed object as a target. Considering the maximum range of the missile, the known delivery altitude, and the prescribed zero point in space, it seems assured that the detonation will occur within bombing range. The rocket will be fired from a manned Air Force aircraft. missile test will come about mid-way in the 1957 series. The Tunnel Shot Solely because it should completely prevent airborne radiation, one test shot of relatively low yield will be detonated in a deep underground tunnel, The tunnel will be practically horizontal, 1,900 feet into the side of a mountain. The tunnel shot is not now planned as an observer shot. Actually there will be little to see since the detonation will be in a deep tunnel - deep enough so there will be no cloud, It is believed that testing devices deep underground may have the dual advantage of eliminating fallout, and making it possible to shoot in any kind of weather. The most diffi¢ult problem encountered has been the re-design of recording equipment which must go underground with the explosive device. Balloon Shots First flight experiments to determine the feasibility of using captive balloons as detonation platforms in nuclear tests were con- ducted in 1955 and 1956 in the Albuquerque, New Mexico area. pee oy CE UrA/Ane \ Orn ~ hh -