r The number and complexity of experiments performW by the Armed Forces were limited primarily because there was insufficient time after notification to the technical agencies to permit the preparation of detailed plans. All experiments were screened by the Joint proof -Test Committee and any experiments which involved duplication, showed insufficient planning, or involved excessive logistics were eliminated. In spite of the lack of time and this screening, a fair program was carried out. The Bureau of Yards and Docks exposed to the blast approximately 150 concrete structures at various distances to determine the damage suffered by these structures. The Office of the Chief of Engineer’s program consisted of constructing four reinforced concrete buildings and an earth revetment and making observations similar to those of the Bureau of Yards and Docks. In addition, the blast measurement group of TU 7.1.1 measured the blast behind this revetment and at an equal distance in the open to determine the effect of the revetment in reducing blast effect. Similarly the neutron measurement group of TU 7.1.1 made neutron measurements behind the revetrnent and inside some of the structures. The Bureau of Ships exposed a large number of panels of different materials coated with various paints and resins for decontamination studies. In addition to these experiments gamma ray dosages were measured behind a number of thicknesses of concrete and steel by means of film badges. The Chemical Corps made measurements with cascade impactors to determine the size of the particIes in the radioactive dust and to pr%ve the efficiency of the Chemical Corps’ collective protectors. The Air Force carried out a fairly extensive program of experiments in drones and in other planes to determine accelerations and stresses involved in aircraft at known distances from atomic explosions. Gamma ray dosages as a function ~f distance in the air, and also the dosages obtained by airplanes passing through radioactive clouds at various times, were measured. The Bureau of Medicine and Surgery made tests on the effects of radiation on various biological and agricultural samples. They also tested animal containers for suitability for. use in future tests. No animals were deliberately exposed for experimental purposes. Reports of Service group experiments are being submitted to the Scientific Director for review in order to check conclusions against the complete findings of the Los Alamos Laboratory. Upon review by the Scientific Director these reports will be submitted to the chiefs of the military agency having primary interest. All scientific operations were conducted in accordance with the Scientific Director’s Operating Plan (SCOP), The SCOP formed the basis not only for movements of TG 7.1 personnel but it enabled all other task groups to prepare operating plans to insure complete support. Because of the complexity of the operations and the requirement for absolute control of all movements, detailed check lists based on the SCOP were prepared for each test. The following tabulation of events indicates the plan of operating at the time of the test. 131