IV By 18 April 1993, sixth shot, BADGER, the first group reached their radiation limits and passed sampling missions to a new group of pilots, 2° On two occasions during Operation UPSHOT/KNOTHOLE, the samplers nearly failed to return with cloud samples. 19 May 1953, during HARRY. The first time occurred on The test director delayed the shot several times because of unfavorable weather, Samples from the shot were very important because af the new device being tested, Ten F-8,G samplers and the AFOAT-1 two B-29 samplers flew the mission, Two "snooper" F-8l aircraft reported thatthe cloud topped 4,200 feet altitude and the base of the mushroom was at 29,000 feet altitude, The first jet sampler took off from Indian Springs Air-Force Base and climbed south of the cloud area, By this time cirrus clouds had begun to form around the nuclear cloud. The sampler pilot came out of the cirrus at 1);,000 feet altitude and could see only a dark smdge on top of the overcast. The F-8 pilot made passes into this dark smdge, obtaining the only samples from the main part of the HARRY cloud. Five other F-8) aircraft took samples from a thin part of the cloud below the overcast, but these samples were of low quality, Two other F-8), aircraft made no contact with the atomic cloud at all and the final two jets did not take off. The cirrus cloud formation ' extended from 50 to 75 miles and appeared solid from 28,000 feet to 43,000 feet altitude. Unfortunately, the samples obtained from the cloud were sufficient to do only the primary experiments scheduled.t” The GRABLE Shot was an atomic shell fired from an Army260-millimeter artillery piece and as for the previous shot Colonel Fackler told the 89 AFWLHO SWEH-2~003 10%