BEGREF ~ 1. APPENDIX E 7 FIED UNCLASSI~1175-AEC ~30-53 33 - £ SOS 17 December 1953 Lewis L. Strauss United States Atomic Energy Commission 1901 Constitution Avenue N.W. washington, D. C. T1741 We consider it absolutely essential to establish 407555 the CASTLE Tests whether there is large close-in’ fall-out accompanying large-scale detonations. This knowledge is essential both to the military utilization and the SUNSHIDE evaluation. The IVY Raft data program, the cloud height measurements, and RAYWIND program were cancelled. These necessary data ccnsequently are rew lacking for SUNSHINE ang Tor the evaluation of close-in radioactive fall-out of lerg “detonations. by close in we mean up to several hundred mi for the CASTL= series. s We propose reactivation of these p for CASTLE. Willard F. Libby ec: Dr. Jchn C. Busher, Director Division of Biology and Medicine U. S. Atomic Energy Commission Washington, D. C. DEPARTMENT OF ENERGY DECLASSIFICATION REVIZW DETERMINATION (CIRCLE wUnAGER(S)] AETANSED hue/fo/on hejhae 14/96 peAeATiCN CLASSIFICATION CHANGED TO: SINGLE REVIEW AUTHORIZED BY: REVIEWER #0): NAME: ‘ae2 DATE: 2/13), 9h 3.CONTAINS NO OOE CLASSIFIED INFO Sevssincationca CLASSIFICATION CLASSIFIED INFO BRACKETED 7. OTHER (SPECIFY}: =e 1045334 UNCLASSIFIED LANL