5. Gave highly significant effects information on high yield explosions. 6. Significantly reduced the requirement for tritium production. CHAPTER 2.1 2. OPERATIONAL CONCEPTS INITIAL CONCEPT The intiial concept of the LASL participation in Operation CASTLE is pre- sented in a classified document (TS) fromthe Director, Los Alamos Scientific Laboratory tothe Director, Division of Military Application, AEC, dated 28 November 1952. The following is an excerpt in substantially the same form as contained in the reference: ie eR nen en e arrmie cman Beate EE NT TR eb ac 21