the search aircraft running into contaminated air when approximately within radar range of the reported position of the vessel, _ (4) Evacuation of native populations: The plans for evacuation of native populations were sound and well-executed, ami should be used as a model for future operations. Certain aspects of the execution of the plan (Tab H) did, however, highlight some festures which could help future operations. ‘These are as follows: J (a) In the interest of safety andl planning, detailed naps anc operational data should be compiled on all northern Marshall Islands atolls amd placed in the hands of ship captins likely to be called upon to execute an evacuation. The element of uncertainty ani risk experienced by the ships involved in the C.STLE native evacuations could have been avoiced, (b) Native populations could be prepared in advance of a test series in mich the same way publicity ie given to the test in the U. S. This would not only alert them to the fact that umusual phenomena would be manifested et varicus times, but would also provide an opportunity to assure them of the measures taken to provide for their safety. (¢) Tre success of an evacuation once it becomes necessary depends upon a rapid pick-up of the population; the task is made ccnsiderably easier if the natives are centr-lly located. Sinco the most prominent mani- festations of a test are the light and sour emitted during theo explesions, it would appear that native populations could be bricfed to rcturn to home islemis upon perceiving these effects. Should an cvacuction again becore necessary, this factor alone could save considerable time. Such a condition existed for the Rongelap evicuction with the exception that the natives temporarily on AILINGINAE remained at that location. 36 However, at ech ztoll