I saw youtube videos of adventure combat ops and had to sign up immediately to give it a try.
This was one of the coolest experiences ever. You start off being instructed by two veterans (I believe both were navy seals) "Wombat" and "Gator" on how to breech doors and clear out buildings properly. Both of these guys are certified badasses and meant business which made the whole experience that much more real.
I don't want to get too extensive here because it would spoil it but you cruise through a massive warehouse loaded with different obstacles and buildings and shoot zombies the whole time. It can't get much cooler than that right?
The whole experience was amazing and I highly highly highly recommend this place and both of the course leaders Wombat and Gator!!