Operation Paperclip was the secretive United States Joint Intelligence Objectives Agency (JIOA) program in which more than 1,600 German scientists, engineers, and technicians (many of whom were formerly registered members of the Nazi Party and some of whom had leadership roles in the Nazi Party), including Wernher von Braun's rocket team, were recruited and brought to the United States for government employment from post-Nazi Germany (after World War II). The primary purpose for Operation Paperclip was for the U.S. to gain a military advantage in the burgeoning Cold War, and later Space Race, between the U.S. and Soviet Union. By comparison, the Soviet Union were even more aggressive in recruiting Germans: during Operation Osoaviakhim, Soviet military units forcibly (at gunpoint) recruited 2,000+ German specialists to the Soviet Union during one night.
The Joint Chiefs of Staff (JCS) established the first secret recruitment program, called Operation Overcast, on July 20, 1945, initially "to assist in shortening the Japanese war and to aid our postwar military research." The term “Overcast” was the name first given by the German scientists’ family members for the housing camp where they were held in Bavaria. In September 1945, the JCS established the Joint Intelligence Objectives Agency (JIOA) to directly oversee Operation Overcast and later Operation Paperclip. In November 1945, Operation Overcast was renamed Operation Paperclip by Ordnance Corps (United States Army) officers, who would attach a paperclip to the folders of those rocket experts whom they wished to employ in America.President Truman formally approved Operation Paperclip in a secret directive, circulated on September 3, 1946.