SECRET Approved For Release 2000IO4H1 Attachment to 5 6 July 1956 On the fourteenth of February you wrote me relative to the 25X1C interest_ in the use of low frequency sound detectors for the collection of guided missile intelligence As I believe I mentioned earlier I sent this on to our Guided Missile Intelligence Committee in order that we could get the views of all interested 25X1C agencies on the subject The GMIC review of_this problem is now completed 25x10 As yon know -has long been interested and has pursued to guided missiles Experiments using these techniques are presently 25X1 underway at White Sand in parallel with the experiments the results of these tests As a result of the discussions within GMIC we have concluded 25X1 that is a feasible mechanism for the Approved For Release Approved For Release Attachment to 5 6 July 1956 collection of certain elements of guided 'missile intelligence and feel that there is a- reasonable prospect of producing suitable scientific aids for such collection 1 can assure you that various groups in -intend to further pursue developments in this promising field and we will keep you informed of significant developments through our established 'channels However if you have any ideas for inde- pendent approaches we would certainly urge you to pursue them and we would be glad to cooperate in any way possible Sincerely your e 25X1A - 2 ApprOVEd For Release This document is from the holdings of The National Security Archive Suite 701 Gelman Library The George Washington University 2130 H Street NW Washington D C 20037 Phone 202 994-7000 Fax 202 994-7005 nsarchiv@gwu edu