Niiiice
I've only played through the tutorial, but from what I've played it seems like it would make a great game with a bit more refining to it.
The gameplay you've decided to use hasn't really been explored properly before in a flash game. It's like Ghost Recon, and would make a good 2D port.
Again, very nice :) Good animations too, with the reaching for clips in your backpocket, etc.