SR-34 I believe. That's over 3 nights of playing multiplayer/S-Ops. Never hit the cap, but than I don't really play all that much. And most of my rank is from Double XP anyway. I've used about half of my 200 matches and after I finish up the rest of it I'm going to pop in the last 200 matches I've been holding on to and that should have me set. Really wanna unlock one of those specializations. Bit annoyed that I remember reading that two were supposed to be unlocked in advance and the remaining six were supposed to be unlocked for CE players, but none of them are unlocked for me.
Fear not, my brothers! The next generation of gaming is upon us! Be glad! A reward for all your toil and all your sacrifices is upon us.
There are those who said this day would never come. What have they to say now?
(Yes, I ripped off a quote from Halo 2 and modified it to my own purposes. Sue me.)