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Looking back through some old military documents (USAF, USAF Reserves, Army & Army Reserves), I see an interesting evolution in the fonts and date formats.
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Your examples also point out that 2-digit year designations were the norm back then. It was only as we neared the change to the new century where one would use four-digit years on dates. A letter writer in the '70's (NOT "1970's") would not worry about confusing the century. Especially in a memo to himself.
Besides, word processors these days automatically type in the 4-digit year for you. Another indication that the CBS documents were written quite recently, on modern machines.
It seems to me, and I'll check this out later, that the standard date format for my USAF stuff was: DDMMMYY -> 09SEP04