Muay thai kickboxing, Brazilian Jiu Jitsu, and boxing. I have a black belt in Okinawan karate but I never applied anything I've learned from that in the ring or street. I've studied other "martial arts" too but don't find them as useful as the "fighting sports" like boxing, wrestling, BJJ, Muay thai. Don't want to debate anyone on this, just my own personal experience in it.
I was also in the military, a bouncer, and a bodyguard.