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P.O. Box 1142 was a secret American military intelligence facility that operated during World War II. The American Military Intelligence Service had two special wings whose core duty was to interview the Prisoners of War (POWs), known as MIS -X and MIS -Y. They were known by their codename, the mailing address "P.O. Box 1142." Notable prisoners housed at the facility included rocket scientist Wernher von Braun, spymaster Reinhard Gehlen, and Heinz Schlicke, inventor of infrared detection. German U-Boat commander Werner Henke was also a prisoner but was fatally shot when he tried to escape by climbing the fence. 
P.O. Box 1142 was based in Fort Hunt, Virginia, formerly part of George Washington's farmlands. German scientists, submariners and soldiers were questioned. P.O. Box 1142 obtained valuable intelligence from German POWs and also communicated with Allied POWs overseas. The camp was in violation of the Geneva Conventions because the Red Cross was not notified of the transfer or location of the prisoners, but according to the surviving wardens, torture was not used. The work done at Fort Hunt contributed to the Allied victory of World War II. It also led to advances in scientific technology and military intelligence that directly influenced the Cold War. In October 2007, a group of the former intelligence workers gathered for the first time since the war's conclusion, and a flagpole and plaque recognizing their contributions were dedicated on the original grounds.
The camp was started in 1942; the majority of the camp facilities were bulldozed in 1946. The post commanders were: Col Daniel W. Kent (1 July 1942 to 21 October 1942); Col Russell H. Sweet (21 October 1942 to 1 February 1943); Col. John L. Walker (1 February 1943 to 18 July 1945); and Col. Zennas R. Bliss (18 July 1945 to post closure).
PO Box 1142 was one of a number of secret internment facilities commissioned by the United States with the goal to exploit the German scientists recruited as part of Operation Paperclip in Europe. In order to prevent scientists specializing in rocket and other sensitive technologies from falling into Communist hands, the United States became determined to prevent the Soviet Union from seizing scientists with this information prior to the end of the war. The U.S. Joint Intelligence Objectives Agency was responsible for sponsoring the operation and took a specific focus on the scientists who had worked on Hitler’s V2 Rocket program.
As many of the former prison guards and interrogators at PO Box 1142 have started to grow old and information become declassified, the substantial amount of information learned at PO Box 1142 has started to come to light. Between 1942 and 1946, the military interrogators at the camp questioned more than 3,400 prisoners with more than 500 of these being scientists that came to the United States as part of Operation Paperclip. During these interviews, significant information regarding German advances in rocketry, jet technology, weapons systems, and acoustic torpedoes was discovered. The United States was able to take this information and develop an effective acoustic torpedo countermeasure.
In 2001, the historian Sönke Neitzel found about 150.000 pages of pick-up protocols made in Trent Park or Fort Hunt. He analysed them together with Harald Welzer, a psychologist. They published several books about their results: