they havent made P-tacs for a while now, several yrs FWIW, they arent easy to find anymore.
the ECA(emerson collectors assoc) P-tac with the hand ground zero bevel grind is the way to fly if ya like P-tacs, i have one of each FWIW, and the ECA is a lot neater, has a true satin finish too, of course they run $400 or so, i found mine back in '01 or so IIRC and it was $200, one of my better deals.
i havent heard anything about them being re-released but ya never know..........
the P-tac was never issued to anyone i know of, IIRC it was originally designed from a similar fixed blade which i think was popular with and used by some spec-ops guys but it was always a custom so they never made many of them.