[ARC5] Re: How Secret Was the ZB/YG System? Not much!

[Mike Morrow]

Mike wrote:

>Interestingly enough, my copy of "Final Instruction Book for AN/ARR-1 
>and Navy Model ZB-3 Aircraft radio Homing Adapter Equipment" is 
>serialized, marked CONFIDENTIAL, and has a red cover.  The contract date 
>is 29 March 1941.....

That is interesting.  I'd never heard of a CONFIDENTIAL book on ZB/YG ypes of systems.

I have a copy of the "Preliminary Instruction Book" for the ZB-2, same contract date.  It's RESTRICTED.  I have a copy of the AN/ARR-2 Operating Instructions dated 01 MAY 1944.  It's RESTRICTED.  I have a copy of the AN/ARR-2 Maintenance Instructions dated 1953.  It's UNCLASSIFIED.

It's odd that early in WWII they apparently raised the ZB and AN/ARR-1 classification to CONFIDENTIAL, but a couple of years later when the more advanced AN/ARR-2 system was out, they lowered that more capable system to RESTRICTED.  Doesn't seem too logical!

Mike / KK5F