First aid - hospital facilities, saying that can help having not so serious injuries, or recovering faster some injuries.
I believe that the only thing this facility does, is to give some reds every few days and has nothing to do with the injury.
What kind if injury you can have, is a matter of luck (and maybe if at that time your player is fresh, has good condition and morale).
Then, you can just use reds for healing
So, First aid facility has nothing to do with injuries
MYTH
Mythbusters of top eleven-hospital.jpg