Between 1945 and 1959, Operation Paperclip was a secret US intelligence program in which approximately 1,600 German scientists, engineers, and technicians were transferred from former Nazi Germany to the United States for government employment following the end of World War II in Europe. It was carried out mostly by special agents of the US Army's Counterintelligence Corps and was carried out by the Joint Intelligence Objectives Agency (JIOA) (CIC). Many of these persons were previous Nazi Party members, and others were previous Nazi Party leaders. ¹⁾

By early 1943, the German government had begun returning from combat a number of scientists, engineers, and technicians, who had returned to work in research and development to help prepare Germany for a long war with the Soviet Union. 4,000 rocketeers were recalled from frontline battle and sent to Peenemünde, on Germany's northeast coast. ²⁾

The Nazi government's recall of their now-useful intellectuals for scientific labor included first identifying and locating the scientists, engineers, and technicians, followed by determining their political and ideological dependability. Werner Osenberg, the engineer-scientist in charge of the Wehrforschungsgemeinschaft, added the names of the politically cleared members to the Osenberg List, reintroducing them into scientific work. ³⁾

In March 1945, a Polish laboratory employee discovered fragments of the Osenberg List tucked in a toilet at Bonn University; the list was later obtained by MI6, which passed it on to US intelligence. The Osenberg List was then used by US Army Major Robert B. Staver, Chief of the Jet Propulsion Section of the Research and Intelligence Branch of the US Army Ordnance Corps, to compile his list of German scientists to be captured and interrogated; Wernher von Braun, Germany's premier rocket scientist, was at the top of Major Staver's list. ⁴⁾

The majority of the Osenberg List engineers worked at the Baltic coast German Army Research Center Peenemünde, where the V-2 rocket was developed. Following their capture, the Allies originally kept them and their families in Landshut, Bavaria, in southern Germany. The captured ARC rocketeers were supervised by the US Joint Chiefs of Staff (JCS) under Operation Overcast, which began on July 19, 1945. However, when the name “Camp Overcast” of the scientists' quarters became widely known in the community, the program was renamed Operation Paperclip in November 1945. ⁵⁾