BACK IN TIME - ROCKETRY/ JET PROPULSION
1919: And there was another factor, too, which - though designed to put a brake on the Germans' rearmament and to slow down their capacity to develop new weapons - actually had the effect of greatly intensifying development. This was the Treaty of Versailles which forbade the production of large ships, of high-capacity aircraft, of large-calibre weapons; but the Ger mans quickly overcame these limitations as far as they could by devoting new energies to making effective weapons within these limits. Thus one had convertible firearms, which could quickly be adapted for military use; one had high-velocity guns; one saw the pocket-battleship arise and the perfection of aircraft and gliders - all factors which, between them, enabled the Nazis quietly to evade many of the apparently inevitable restrictions of the Treaty of Versailles.
1930s: Even in this field the Germans were working secretly on a number of projects which were later to surprise the Western world at large; jet-propulsion was at this stage very much more highly developed than the Allies knew, and rocket-powered aircraft were already on the drawing board. The most terrible of all of the German secret weapons were the rockets, of course - and these were beginning to be developed too, behind closed doors; as early as 1931 the first of the modern liquid fuelled rockets took to the air and reached a height of perhaps 1,000 feet from a base in Dessau and within two years secret teams were investigating the possibilities of manned rocket flight. The quickest way of reaching the enemy is through the air, and it is only natural that it was the Luftwaffe research establishments that were amongst the most progressive in forging these new, surprising weapons of war.
1945: President Truman authorized Operation Paperclip in August 1945; however he had expressly ordered that anyone found "to have been a member of the Nazi party and more than a nominal participant in its activities, or an active supporter of Nazism militarism" would be excluded.
Under this criterion many of the scientists recruited, such as Wernher von Braun , Arthur Rudolph and Hubertus Strughold , who were all officially on record as Nazis and listed as a "menace to the security of the Allied Forces," were ineligible. All were cleared to work in the U.S. after having their backgrounds "bleached" by the military. The paperclips that secured newly-minted background details to their personnel files gave the operation its name.
http://naziscienceliveson.devhub.com/
1945: What the intelligence community knew, and most people did not, was that in the final frantic hours of World War II, the Soviet army had hastily raided Germany's most advanced weapons research laboratories. And, on Aug. 29, 1949, only four years after Hiroshima, the technological booty from those raids turned a country whose farmers still used horse-drawn plows into a nuclear superpower.
http://greyfalcon.us/restored/myPict...ar%20sucer.htm
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"Popular Mechanics" America's Nuclear Flying Saucer: NOVEMBER 2000