SWOTR DEC 3 1958 Dr, Hal Plank J~Division Los Alamos Scientific Laboratory P, 0, Box 1663 Los Alamos, New Mexico Dear Dr, Plank: DCS/Operations, AFSWC, recently asked Field Command, AFSWP, to furnish us guidance on future test plans. In particular, we were con- cerned about the dual shot capability proposal for HARDTACK and the possibility of simultaneous testing tn both the Pacific Proving Ground and Nevada Test Site, JTF SEVEN, They, in turn, made inquiry to the Commander, A part of the reply from JTF SEVEN signed by General Perry B, Griffith is quoted for your information: "The current concept being envisaged for Operation HARDTACK contemplates the probable firing of two shots on the same day on some occasions, and perhaps in a few instances, at the same time. However, while some additional aircraft will be required, it is realized that a complete dual sampling capability probably cannot be supported, nor is it justified, Therefore, in order to have an adequate number of sampling air- craft available on dual shot days, attempts will be made to have one of the scheduled shots a low yield detonation requiring relatively limited participation so far as sampling air- craft is concerned,” I still have not received the required information on the RB-57D from Major O'Carroll, but should have it very soon and will let you know, - Very truly yours, WILLIAM 4. CUNNINGHAM Major a USAF AFWL/ HO ppl