Haha... EA's screwed it up big time! I'm a Gunnery Sergeant now!
I unlocked the PKM, love it. The G3, awesome. Didn't like the L85A. Planning to unlock G36C or M95 next.
God, I hope they fix this soon. It looses its meaning when everyone else in the game is a either Major or Gunnery Sergeant or something.
The ribbons come way too quick too.