than expected did the pilot negotiate the landing safely, His wingman stuck with him through all this. Results from the detonation of the KOON device eliminated the necessity for ECHO which was to follow, This had little effect on the Task Group 7.4 plans, except to lower the mission aircraft requirements a bit. . After five postponements, UNION followed on 26 April 1954. During the sampling operations, one F-8) sampler was replaced by a spare when his wing tank fuel system wouldnot operate. Personnel decontaminated the one B-36. sampler and seven F-8 samplers, accomplished maintenance, and had these aircraft ready for another iiission within 2h hour.” YANKEE event fired on 5 May 195) and the test director expressed the desire for another shot within 2.to 48 hours so the group used only half the aircraft. Two B-36 sampler aircraft flew into the cloud, each bringing back a double sample, There were also nine F-8) samplers on the mission, Several postponements caused NECTAR Shot to be fired on 1h May 195k... On one occasion the shot was called off after all aircraft had taken off and were in position for zero hour, The detonation produced a yield of about 1,6 megatons and the samplers had trouble, Alarge concentration of cirrus clouds formed around the cloud and the cmtrol aircraft could find littleto sample, A good many of the sampling aircraft arrived in the vicinity, as scheduled, orbited, waiting for a chance to penetrate the cloud, then were forced to retum to base without samples. When they arrived at Eniwetok, the sampler pilots had to make landings in heavy rain, Many of the F-8) sampler aircraft had electrical trouble. lil AFWLKO In the SWEH~-2 -003h, (0°