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TOP SECRET (PSP-SUBJ)394 SECURITY INFORMATION EXECUTIVE OFFICE OF THE PRESIDENT NATIONAL SECURITY RESOURCES BOARD WASHINGTON 25, D. C. OFFICE OF THE CHAIRMAN Honorable Harry S. Truman The White House Dear Mr. President: This communication and the enclosed memorandum are written in accordance with the statutory responsibility of the Chairman of the National Security Resources Board to advise the President concerning the coordination of military, industrial and civilian mobilization. It reflects my concern with the strong possibility of the Soviets' con- tinued development of more and more effective nuclear weapons -- with all their implications of mass destruction which may be visited upon the United States as the Soviets realize their capability to deliver such nuclear missiles on American cities and industrial centers. Have we exhausted all the scientific and technological means at our disposal to defend the United States against nuclear attack? I believe a complete, thorough investigation of this problem by the most competent authorities available with all the resources that can be placed at their disposal is warranted. Unless we can develop a defense more adequate than that now existing or currently projected, a strong possibility exists that the United States could be rendered impotent by a single surprise nuclear attack. We recognize the outstanding efforts being made by the military to develop adequate protection against damaging surprise attacks. It may be that a new reinforcing scientific effort can aid in solving this immediate danger. I urge your serious consideration of the recommendation contained in the enclosed memorandum. Respectfully, DECLASSIFIED Authority. NLT 2003-001 #4 so NARA, Date 3/16/10 Jackson By Jack Gorrie Chairman Enclosure TOP SEGRET SECURITY INFORMATION