§. The yield of “BIL.VO was three times the nost probable predicted value and twice the predicted upper limit, Consequently, more radioactive debris was carricd up and diffused over a uch larser erca than was expected. HL.VO demonstrat. 4 that the origin of the fallecut pattcrn is &@ large ares’ up to 25 miles in radius, varying accoriing to the yield. Uidicoe active intensitics at specified distances, likewise, varies with the yicld. & BaiVO produced high contamination on populate: areas ismedictely to tho east of the test site which necessitat.d the ovecuation of groups of Morshall Islands natives and certain U. S. military sersonncl, Elements of the task force fleet and personnel were involved in early f2ll-out which necessitated full use of navel atomic countermeasures and retirement of the fleet to recions more distant from ground sero. The incidcnts assceiate ed with this shot resulted primarily from the lack of fall-out information from previcus shots of comparable yield, the unexpectedly hich yield of Hu.vo and an average deviation of approximately ten degrees (in *n adverse direction) between the observed and forecast winis for shot time. The net result was an aggrevation of the adverse. conditions ordinarily predictable and acceptable under operational criteris ani forecasting techniques in existence pricr to the BRAVO event. "J. all CaSTLE shots subsequent to BR.VO were detonated sithoat sisnificant fall-out impact. This was duo to complete analyses of the effects of Hu.VO, the application of this inform-tion in the development of realistic and dopendable fall-out forecasting techniques and the devclop= ment of better liniting wind pattern criteria within which the fsil-out pattcrn could safely lic. 8. ° 82 natives of Rongelap toll and 154 artives of Utirik ware evacuated to Kwajalein .toll as a result of the f-il-out fron