TAB A APACHE EVENT OPERATION REDWING 1. APACHE was detonated on a barge in the MIKE crater on the site of ELUJELAB Island (FLORA) in the ENIWETOX Atoll at O606N, 9 July 1956. The cloud attained an estimated altitude of 70,000 feet, 2. All winds were of lower velocity than cn previcus shots with the result that the clcud retained a symetrical shape for abcut an hour until the section of the stem bolow 15,000 fcet began to drift to the west-northwest. The porvion of the cloud between 20,000 feet and 35,000 feet, which contained tho greater concentration of radioactivity, was observed on radar on a course of about 030°, the center reaching a distance of 65 miles fron ground zero in four hezrs. 3e The P2V aircraft wes placed at 10,CO0 feet on an east-west pattern over JAPTAN Island in an effort to esceriain at an eerly tine whether any fallout migit be expected on the lover islands of the ENIWETHK Atoll, and the lagoon, since the mushroom extend2d well beyond the wost distant islands of the atoll, and appeered for a long time to be stationary, 4. pHA No fallout was encountered in this pattcrn and reentry hour was established at 1000K, 5. While conducting the lagoon and atcll s.rvey the P2¥ encountsred a field of 1100 mr/nr el end ne vicinity of shot else at 1020M at 1000 fect,