I had an idea about how to improve the current damage model in Arma 3 to be more realistic.
I got inspired by the f2p game Heroes and Generals. If you take damage by a bullet, you take an amount of damage, and a part (about half) of that taken damage will heal gradually over time.
My idea is to use a similar model in Arma 3. But unlike in Heroes and Generals where you automatically heal over time, you will have to use a bandage to heal. Thus replacing the old model where you get back to (I think it is) 75% always after using a bandage.
Also, I think that when you get shot in the leg, you shouldn't die after a couple of shots, but you either bleed to death or fall unconscious. I also think that after a specific amount of damage you should not be able to stand on your legs anymore and can only prone since the bullet holes cause too much pain.
I hope you will advance the medical/damage model in Arma 3, because it's even more basic than arma 2 at the moment.
Thanks for reading!