just before dawn, They experimented with various times and altitudes over - target area, and checked light conditions which were also being observed on the surface, On 22 March 1948, General Kepner flew over the area on one - of these missions with Colonel Kilgore, and it was decided detonation times for SANDSTONE could be determined, The drone aircraft unit had discovered that, at altitudes over the target area, it was daylight some ten minutes before it was light on the surface, Therefore, the lighting problem was solved by exploding the device some ten minutes before daylight arrived at the water surface. 58 Another problem was settled during the training program, island, in the test area, shouldthe drones operate? From which The ideal plan would aA have been to operate the entire unit from Eniwetok because this island was near the target area. However, Eniwetok was a small island and already overcrowded with essential operational units, drone operations on Kwajalein, The first proposal placed For a sampling mission they would be launched, flown to the atomic cloud, then landed on Eniwetok where the Atomic Energy Commission personnel could remove the samples.?? As a drawback to this proposal, the Pacific area was subjected to frequent rain squalls, During the two and one-half hour flight from Kwajalein to the target area, rain would be hard on the filter papers in the boxes on the fuselage, and probably would rip the papers up, islands the drone unit altered this procedure. After arriving in the On the day before a scheduled shot, pilots would fly the drone aircraft manually to Eniwetok and land them, The ground controllers would go to the island algo. 18 AFWLU/HO SWEH -2~003h, 4 On (