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SRH-026 WAR DEPARTMENT THE CHIE? OF 3TAFF Washington, D. C. a March 15, 1944 Dear Eisanhower: You are undoubtedly awars 01 the supreme impor- tance which the War Department attaches to intelligence known as "ultra". This intelligence is secured by the British Iron reading Cernan enciphered radio communica- tions. The attached Tab seta forth the basis uoon which German "Ultra" intelligence 13 made available to American field commands. Please give this matter your personal attention, and take all necessary steps to insure that the security regulations governing the a1332rination of "Ultra" intelligence are meticulously observed. Tha arrangementa described in the attached Tab ara to be fully carried out. Faithfully your3, /8/ G.C. MARSHALL General D: D. Eiasnhower, Supreme Headquarters, Allied Expeditionary Force, London, England. DECLASSIFIED per Sec. 3, E.G. by Director, NSA/Chks, NYS WRY 12/28/78