Seems like overcomplicating ofp to me if you want the other side to recieve treatment aswell.
This would be pretty big eventually though cos they would need all their weapons removed and captive behaviour etc
As I dont think a dead guy would be able to get on a vehicle then you could have to simulate that, by having him auto transport to some place on the map when a m113 drives next to him for example, to create an illusion the guy was loaded on.
Then have the m113 drive to the next guy who is "dead", have some counter on it so it cant take infinite amounts of folks, then have it drive to that field hospital and have all those bodies transfered there with setpos.
And there heal em.
No idea if it would be a casuality in mission stats either, would have to try later.
generally the script wouldnt be hard, just complicated and quite long