The shot detonated on schedule and the atomic cloud began to climb, The "beeper" pilots turned their drones off station, aimed them at the cloud, setthem on automatic pilot, and turned them loose, then the control aircraft raced around the cloud to retrieve the drones on the other side, Similar to Operation CROSSROADS, this time, however, the control aircraft turned their drones around again aimed at the cloud. On the third penetration, five of the seven drones made contact with the cloud, bat the dronesat 18,000 and 20,000 feet did not penetrate because the "beeper" pilots could not locate any portion of the cloud at their altitude, ne The seven drones landed safely at Eniwetok, where the Atomic Energy Laboratory. Preliminary investigationindicated that the weakest sample collected on X RAY was stronger than any taken during Operation crossroans ,° YOKE Shot. YOKE Shot was detonated on 1 May 1948, Drone operations were a repetition of X RAY with the exception of a drone flying at 20,000 feet altitude, After arriving on station, the B-17drone at 20,000 feet was pulled out of its position and sent to 30,000 feet altitude, directly over the detamation., detonation. A camera in the drone exposed a picture just at When the shock wave hit the drone, it was not damaged, but the “beeper* pilot had some moments of control difficulty. ‘Colonel Kilgore recommended to the air conmander that this drone be withdrawn from sampling, The other seven drones collected their samples on three passes and returned to Eniwetok, These samples were even better” than the ones collected previously, 65 20 APWLHO SWEH=2-003); aA Ot ay me Commission crews removed the samples and started for Los Alamos Scientific