I've been training BJJ for a couple years and have a handful of friends/training partners who fight MMA professionally. I've thought about trying MMA, but i've realized that blunt force trauma probably isn't the best thing in our profession. Jiu jits is fine because you pop an arm or an ankle, you're out from work for a couple weeks or a month. You get knocked out, or punched in the head repeatedly, not too good. I'm sure it would be a huge pain in the ass if the FAA every saw a concussion on your medical.