Combat WHAT???

1st thought ... Never heard of it!
2nd thought ... Is that politically correct?
3rd thought ... Better look it up.

Youtube© first stop. Yikes, it looks like a cross between Judo, Greco-roman and Cumberland and Westmorland wrestling.
The ubiquitous Wikithingy came next, it spake thusly ...
"Sambo (Russian: ??????; IPA: {?samb?}; ??????????? ??? ??????) is a Russian martial art and combat sport. The word "SAMBO" is an acronym for SAMooborona Bez Oruzhiya, which literally translates as "self-defense without weapons". Sambo is relatively modern since its development began in the early 1920s by the Soviet Red Army to improve their hand-to-hand combat abilities"

Well, they say you're never too old to learn.