were 62 fatalities and 3,879 disabling injuries, which was about 62 percent below that of private industry. Warren was personally responsible for the safety aspects of the Trinity nuclear test on 16 July 1945 at Alamogordo, New Mexico. There was considerable concern about radioactive fallout and a network of geiger counters was established to track the fallout cloud. Groves found Warren at the base camp shortly after the explosion and was displeased to discover that Warren had been awake for the previous 48 hours. Groves had US Navy Captain George Lyons take over so Warren could get some rest. Fortunately, no problems arose with the test. The atomic bombings of Hiroshima and Nagasaki were carried out on 6 and 9 August 1945. On 11 August, Groves phoned Warren and ordered him to organize a survey team and proceed to Guam, and thence to Japan to evaluate the effect of the atomic bombs and take measures to insure the safety of Allied troops occupying the cities. Initially the survey team was to accompany the assault troops of the III Amphibious Corps and the V Amphibious Corps in the invasion of Japan, but Japan surrendered on 14 August, the day the survey team departed San Francisco by air. The survey team arrived on Tinian on 17 August, where it was split into two parties, one under Warren and the other under Friedell. Warren's party, equipped with portable geiger counters, arrived in Hiroshima by air on 8 September as part of a group headed by Brigadier General Thomas F. Farrell that also included Brigadier General James B. Newman Jr and Japanese Rear Admiral Masao Tsuzuki, who acted as a translator. They remained in Hiroshima until 14 September and then surveyed Nagasaki from 19 September to 8 October. They were impressed by both the damage done by the atomic bombs and the extensive Japanese preparations for an American invasion. The detonation of the two atomic bombs in Japan "raised as many military and medicomilitary questions as they answered". A series of nuclear tests was planned, codenamed Operation Crossroads. Some 42,000 personnel were deployed to Bikini Atoll as part of Admiral William H. P. Blandy's Joint Task Force 1 to conduct the test. Their health and safety was Lyons's responsibility, but the specialised job of radiological safety was handled by the Manhattan Project. Warren, as Chief of the Radiological Safety Section (RADSAFE), planned and implemented