410198 WT-916 (EX) EXTRACTED VERSION OPERATION CASTLE Project 2.5b Fallout Studies Pacific Proving Grounds March — May 1954 Headquarters Field Command Armed Forces Special Weapons Project Sandia Base, Albuquerque, New Mexico February 1956 NOTICE This is an extract of WT-916, Operation CASTLE, Project 2.5b, which remains classified SECRET/RESTRICTED DATA as of this date. Extract version prepared for: Director DEFENSE NUCLEAR AGENCY Washington, D.C. 20305 15 May 1981 Approved for public release; distribution unlimited.