There is an achievement for attaining the rank of Private First Class.
When I started R6V2 I was called a veteran and began with some items already unlocked and my rank began at Private First Class.
I did not receive an achievement for being a Private First Class.
Any one else not have theirs?

(I am highly ranked in R6V is that what may have caused this?)

SAME HERE. i guess ill just play the shit out of r6v2, then delete all saves and start anew in hopes that it will come up. wont take me long at all to rank up to that.

They are aware of it and fixing. It was because you played the previous Vegas they knew you were not a rookie and started you out later. Their going to fix it tho along with all the ranking up glitches they say. I was also cheated out of beating the game on realistic like many others... if you do it out of order it screws up and does not unlock it

Yeah the realistic glitch got me on Vegas 1 too.
Hopefully there is a patch soon.