I've enlisted in all ops/challenges on mw3 and blops2 and i've noticed it's become a bit bugged, it say we are "Enlisted" then when it starts and you click on the challenge/operation it says "Not Enlisted".
Have been having this same issue on blops2. It is also not giving us all of our points for challenges.. For example. If you play a match and get three captures of the flag it will not give you those captures some times to go toward the clan points.. I played yesterday and got atleast 20 captures and only got rewarded for 5 of them. I have also noticed that if you go to the elite page after playing a match and click recent matches, the last map you played will be listed differently then what you actually played.. for example, if u played on standoff it will show aftermath as the map you played.. sounds like Elite has a lot of issues going on.