When President Dwight D. Eisenhower received his first report on the SIOP 62 (for fiscal year 1962), he commented that it “frighten[ed] the devil out of me.” An excellent history of the creation and evolution of the SIOP, including many declassified documents, is available from the National Security Archive website: http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB130/index.htm#1. In the documents section, see Document 28: Headquarters, Strategic Air Command, History & Research Division, History of the Joint Strategic Target Planning Staff: Background and Preparation of SIOP-62, n.d., available from: http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB130/SIOP-28.pdf.