I am being a little harsh, but any constricted percentage of a population will have the same (approximately) standard as the supplying population. Within reason. You don't see billionaires, but you do see well-off guys, people for whom it's a family tradition or have a calling to serve. Those cats are typically okay, but the gross majority, as is the gross majority across the US, are kind of just substandard clowns who only show up to work in the Military because 250 pushups is more of a punishment than losing your job working at the soda jerk for $12.17 an hour.
The Military, especially the Enlisted side of the house, is mostly like hand-holding kindergarten shit. Only about E-6 or E-7 to E-9 are really worth their weight; but those are often times lifers. Most personnel do their 4 or 6 or 8 and dip to go to college. There are outliers, though. I knew an E-5 in the Navy who was a knuckle-dragger on a Boomer, and he was as smart as they come. Just happened to be a Nuclear Engineer in the Navy, which I think is the hardest position to get. It's either right above or right below aviator.