Quote Originally Posted by Ramil
Well, I'm not a specialist, but a friend of mine is. And he said that the only combat system that is worth the time spent is Sambo.
http://en.wikipedia.org/wiki/Sambo_(martial_art)
IMHO, it doesn't matter which style (combat system) you choose. Also, you need to clearly realize the difference between what the special forces do and the sports. I'll try to explain it again with a simple example.

Imagine a weak little girl standing on the top of the staircase. There's also a huge dude standing beside her looking somewhere and minding his business. All of a sudden, the girl would give a gentle push to the dude and he would fell off the stairs, break his neck and die. That what the special forces are trained to do. No matter if they use hand combat, firearms, or spades. That, of course, is not a sport since clearly the girl violated all the rules imaginable. In any sport the girl would lose to the dude.

To sum it up, sambo as a sport is just a sport - the stronger would prevail.