Profile of retired Col. Carlyle Harris, a former POW in Vietnam who is credited with introducing the tap code, which the prisoners used to communicate. (U.S. Air Force Video // Jimmy D. Shea)
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master key system
The Code

Profile of retired Col. Carlyle Harris, a former POW in Vietnam who is credited with introducing the tap code, which the prisoners used to communicate. (U.S. Air Force Video // Jimmy D. Shea)
source
master key system
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