You keep comparing completely unrelated bullshit in an effort to confuse everything. Getting into a physical fight with some dude is not comparable to serving in a modern military.
It wasn't even comparable in the ancient world. I am sure those Spartacan gladiators could have ripped legion troops to pieces in one-on-one fights on the street, but that didn't mean they could compete with a professional legion marching down out of Gaul and Iberia.
The requirements of an army are not the same as the requirements for a street fighting gang. LOL