APPENDIX "E" DRAFT LETTER TO THE JCAE 1, On September 17, 1957 I wrote to you concerning our plans for testing in Operation HARDTACK, the spring 1958 test series at the Enilwetok Proving Ground, and noted that as our plans were further developed, I would keep the Committee informed. 2. We now have a reasonably firm program of tests in hand which has been approved by the Commission and concurred in by the Department of Defense. about April 15, Operation HARDTACK will start on or 1958 and will consist of about 24 firm laboratory and DOD effects shots, In addition, there are three contingent shots whose firing depends on the outcome of their counterparts among the firm shots, 3. We are planning to conduct a small series of nuclear tests underground at the Nevada Test Site in the fall 1958, to be known as Operation MILGRACE, About four low-yield devices will be fired underground in existing tunnels. The detonations will be completely contained and no fallout will result. 4, Besides these tests, we plan to conduct up to ten safety tests in 1958 at the Nevada Test Site. is to determine that, The purpose of these tests if certain designs are detonated accidentally, no nuclear reaction would occur, 5. The President has authorized the expenditure of the required special nuclear materials for these tests. description of the tests, The detailed the devices involved and their objectives is attached. ~ oh. Tae A OPERTIN PT aeTER LASSIE Tab EG. 1228, dea. 3.8 MIA!DIALOGA “Df, (AQ Tata ™ Appendix "E" _