| http://www.w3.org/ns/prov#value | - According to documents, including memoirs written by former POWs, a number of the airmen who flew combat in Vietnam had been trained in special coding methods as a survival technique, should they be captured...When the Robertson, Stevens, and Lundy letters came in, as revealed in archival records, they were given to the special Pentagon unit trained to decipher codes and other authentication tec
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