The initial results of the above work indicated that a number of the proposed possible detonation altitudes over Johnston would be unacceptably hazardous. This led to several rather heated meetings between Task Force personnel, particularly the scientific deputy and his safety advisors, and the technical . the advisors of the DOO for examp |e ea Mc Millan committeeyon what compromise could be effected. The detonation points could be moved a Hawaii within the limits of the missile systems proposed. little away from However, that distance could not be increased significantly since most of the pertinent measurements had to be made either from the ground on Johnston Island or from smal! missiles launched from Johnston Island. Some consideration was given to sea launched small rockets, however, the time to develop such a capability was thought to be excessively long. It was recognized that a detonation above approximately 250 kilometers would release most of its energy as x-rays and no Jarge ; bright fireball in the visual wavelengths would be formed. Thus the shots above that altitude were considered sate although reconsideration of that problem continued right up to the time of detonation. re ea FSI Herman Hertand-was the main advisor to the scientific deputy on this subject. Shots below 110 or 115 kilometers (Raeealcheck this number) could not be seen from Hawaii so the eye burn problem could be handled as long as there was the appropriate restriction on aircraft and shipping. Hence the danger area declared eventually varied in size with the particular detonation and also varied as a function of the altitude of the observer. The DOD planners felt very strongly that Ct shot in the region of 200 kilometers was needed since this was one of x the favorite |. , com, - CnlleaKec altitudes of intercept for the proposed Nik& Zeus or Nike #& angeaeebrehtcmissile system. A shot at this altitude, could, of course, be seen from Hawaii. This proposed shot involved image sizes on the retina of people in Hawaii that were somewhat smaller than we had experimental information for. The brightnesses