Indeed, if the situation ends up toe to toe... and you're not fighting anyone with the balls for that at this point... then the fit truly has hit the shan.
However, the Marine Corps has a pretty extensive training program called MCMAP(Marine Corps Martial Arts Program) which follows after the UFC Mixed Martial Arts fighting model. The first couple of belts are easy enough for a 10 year old to get, but once you hit green belt training, it gets fairly useful.
The army has a similar model called Combatives.