So when I was signing up for the navy my recruiter said there were high school kids that do qualify to have a seal contract. They have to pass a bunch of qualifications all the way up to boot camp and then even in boot camp they'll have different requirements as long as they pass all the requirements they'll go straight to buds
Most military does pretty minimal hand to hand combat with the exception of special forces (seals) etc. But even them it's not much they do alot of exercises to try to always get back to the gun almost like a boxer in ufc who does alot of takedown defense