(ec) Dynamic systems of forecasting fallow using air. particle trajectory analyses ond progressive forecasts of wind patterns in accorjanos with time and displacement aspecte of the cloud, were found to be feasible within the tine limitations of an operational decision, Practi-~ cal methods were divised to apnly such « system to the last three CASTLE ahcts for a valid forecast period of H to H plus 24 hours. (4) air RADEX plotting for # to H plus 6 hours was used to advantage to define exclusion areas for cperational aireraft and for de- fining appropriate areas for cloud sampling, (e) CASTLE data and efforts were sufficient to support profitable interim studies on new forecasting techniques andi refinementa cf current systeas for the development of reliable fall-out predictions, d.. Dosimetry (1) The routine Maximum Permiseible Expoeure (MP3) of 3.99for the operation was inadequate, in some cases, for ths cumber and yields of the shots detonated, (2) The special MPS of 20m for crew osmbers of cloud sampling aircraft wag adequate, . (3) In recogniticn °f the inadequacy of the routine MPE, authorisation was requested from, and granted by, the Surgeens General of the three Services emi by the- Director, Division of Biology and Medicine, AEC to revise the MPE through waiver from the Task Force Commander in individually desig-e nated cases when circumstances indicated the need and justification therefor. This authority, exercised for a relatively few mumber of individuals, was adequate for the completion of essential CASTLES missions. (&) The primary factor in the maintenance of personnel dosages 9§