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10, the MON DECLASSIFIED 25 September, 1945. E.O. 11652, Sec. 3(E) and 5(D) KOGAN TO GUSTAFSON 12272 By NETTHE ' NARS Date 4.17.25 TOP STORET RECORDS : Dear m President Ever since the U.S.A. demonstrated to the world the terrible effectiveness of the atomic bomb I have been increasingly aware of the fact that the world is now facing entirely new conditions. Never before has there been a weapon which can suddenly and without warning be employed to destroy utterly the nerve centre of a great nation. The destruction wrought by the Germans through their air fleet on Warsaw and Rotterdam was startling enough, but subsequent attempts to do the same to London were defeated though without much to spare. Our own attacks on Berlin and the Ruhr resulted in the virtual destruction of great centres of industry. In Europe the accumulated material wealth of decades has been dissipated in a year or two, but all this is not different.