much data was not obtained. In spite of these and other obstacles, however, and because of the effort of the experimenters, the major programs planned for the tests were performed and satisfactory results obtained. Following J#/ » anew project, Project 4.1, was officially added to the test program. This project, entitled "Study of Re~ sponse of Human Beings Exposed to Significant Beta and Gamma Ra~ diation Due to Fallout from High Yield Weapons," was sponsored by AFSWP and arose as a result of the native evacuation. In view of the magnitude of Operation CASTLE, there were few problems which confronted the scientific, military, and construction personnel which did not find solution. What had been a prob- lematic situation in previous operations had been reduced in many areas to routine by the time of CASTLE and even results which were not totally expected were met and dealt with without reducing the effectiveness of the overall operation. The first shot in the se- ries, as has been discussed, produced a much larger yield than had been predicted and this meant change and review of the entire operational perspective, The flexibility included in the original Plan, as well as the ability of the Tesk Force to choose among al~ ternatives after the first of March, proved to be of inestimable worth to the accomplisnment of the CASTLE mission. 143