| Encryption and Cryptographic Equipment | |
| This cryptographic system used a "one-time-pad" of frequently changing crypto keys. Used well into the late-1970s by foot troops for secure voice, the system was mostly phased out by 1980 and replaced with electronic scrambling systems. | 
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| KY-136/UPA-38, Video Coder,
a unit of coder group AN/UPA-38 Manufactured by: Raytheon Manufacturing Corporation, Waltham, MA Contract Number: NObsr-64545 |
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| KY-200/UPX-12, Transponder
Decoder Set, a unit of transponder set AN/UPX-12 Manufactured by: Radio Receptor Company, Inc., Brooklyn, NY Contract Number: NObsr-64568 |
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| KY-80/UPA-24, Video Decoder Manufactured by: Unknown Contract Number: NObsr-63397 |
No photo available |
| KY-61/UPX-1, Coder-Decoder,
a unit of radar recognition set AN/UPX-1 Manufactured by: General Communications Corporation, Boston, MA. Contract Number: NObsr-49224 |
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