I don’t know how I missed this video from a few years ago, but it suggests that the Marines take close-quarters combat rather seriously:
It also makes the point that mixed-martial artists, despite their cross-training, have hyper-specialized on one-on-one, unarmed combat.
The Marines they’re dealing with aren’t run-of-the-mill Marines, of course. They’re likely black-belts in the Marine Corps Martial Arts Program. I don’t know how much training they have over and above the bare requirements, but a black-belt in that system only requires as many hours as a BJJ blue belt (the first belt after white).
By the way, that “Last of the Mohicans” exercise looks like fun.