EXTRACTED VERSION HISTORY OF OPERATION CASTLE Pacific Proving Ground | 20995 d Joint Task Force Seven Major General P. W. Clarkson United States Army Commanding Spring 1954 NOTICE This is an extract of History of Operation CASTLE, which remains classified SECRET/ RESTRICTED DATA, CRITICAL NUCLEAR WEAPON DESIGN INFORMATION asofthis date. Extract version prepared for: Director DEFENSE NUCLEAR AGENCY Washington, D. C. 20305 "4 JUNE 1983 Approved for public release; distribution unlimited.