This all sounds like pretty much every starting undergraduate student I've ever encountered.
Similar for other technical tracks like aircraft maintenance. The bar to entry for these kind of jobs are minimum ASVAB test scores that aren't easy to make.
You may have encountered a lot of ex infantry or similar. They get intensive training as well, just not as cerebral.
PSA: While IRAC is generally associated with law school and lawyers, anyone can learn and use it. It really does works.
I mentioned the asvabs not as a comparison to writing a paper, but to note there is a bar to get into the highly technical jobs. Similar to the bar created by things like minimum SAT scores for some schools.
Talk to an ex military person that had a highly technical job that required 6+ months of military tech school. They have the skills you are talking about.
Talking about ex military like they are one homogeneous group just doesn't make sense. Skills vary, just as with recent high school grads.
It might not require the kind of very technical training that say Navy nuke school does, but assuming sandworm was talking about proper "special forces", as in Army SF, most of those guys tend to be older, more mature soldiers and I believe all Army SF candidates have to take the DLAB and then attend language school for 6+ months. I would have assumed that sort of environment would actually translate fairly well to undergrad.
Also, FWIW, I don't buy the premise anyway. Some percentage of fresh HS grads do well at college, some don't. Same is true for military vets. I was trying to pinpoint a specific group that I knew would mostly do well to dispel the notion that vets are somehow not great candidates for it.