I hate to contradict Frank Hackley, a fellow Woodin Lab Board Member and far more expert on any U.S. military caliber of ammunition than I, but unless Taiwan made the headstamp in question for someone other than themselves, or have changed finally to the Julian calender, it cannot be from Taiwan. Until recently at least, they were using the Chinese Republic calender, based on 1911. A date on a headstamp of “06” by that calender, would be made in either 1916 or 2016!
Both the letters TA and TZ have appeared as Isreeli headstamps, and to meet the NATO three-entry code requirement (I think there is such a requirement) Israel has used the code TZZ, which we all know. TZ represents Hebrew words, I think (am I doing alright so far, Jon Cohen?), while TA represents English-language words. So, why not a TAA headstamp for a contract for the U.S.A.?
All Taiwanese ammunition I have seen has had a red PA, not that that is any kind of conclusive evidence at all, but most Israeli ammunition has the purple primer seal mentioned here. Coincidence? Could be.
I am probably getting in trouble here, like I have lately on lots of threads, trying to use logic to find answers for things I know nothing about, but I gave it my best shot guys. If I am wrong, I am wrong.