So, I've only made it to level 17 or so, but the pro perks system seems to be quite a bit different than Black Ops. In Black Ops it seemed like you had 2 or 3 specific tasks you had to do to gain the perk, and they were all completely different. It seems like the in game challenge menu Black Ops clearly defined what you had to do to get the pro perk.
What do you have to do to get the pro perks in MW3? I've already completed a few level I challenges like Recon and Sleight of Hand, but no pro perk and I'm progressing through the level II challenges.
Are the pro perks based on your level? I can still only select about half of the basic perks because of my low level, so I'm hoping it's something along these lines.