LONG POST BUT PLEASE TAKE THE TIME TO READ THIS< IT WILL MAKE ARMA 3 MUCH MORE REALISTIC
What is on my arma 3 wishlist? If I had my own way arma 3 would have improved netcoding so i can shoot someone and they will register every hit, physics would be cool but i really am only looking forward to netcode improvements, underwater and hopefully cave battles (VBS has this) and ofcourse.......
Realistic wounds!!!!!!
Not like ACE or vanilla Arma 2.
Different rounds cause variable wound profiles. Depending on ammunition behaviour @ speed x and depending on hit location the bullet will simulate what it does in real life. A fragmenting round will fragment at x velociy and cause y amount of bleeding.
Bleeding leads to unconsciousness, shock, and cardiac arrest. Unconsciousness can lead to discontinuation of breathing, and the wound will cause pain, generally a direct hit will cause the target to become incapacitated.
Damage to CNS, Head (brainpart of CNS

), excesive bloodloss, cardiac arrest amoungst other stuff like glitching into a rock on an ATV will kill a soldier in arma3. Consecutive shots should not kill a unit unless they are to vital areas such as CNS..
Ammunition will be more than just "5.56x45mm STANAG":
Different types of ammunition in use by the military should be simulated.
For example, USMC use mk.318 SOST, US Army use m855a1, some special forces SAW operators use m995 Armor piercing ammo, but for the sake of the game, and USA vs Russia scenario shoulod use armor piercing ammo instead of ineffective ball rounds.
Body armour simluation would be cool too, as in soft armour could proetc t against pistol rounds at close range, and hard armour will protect againts certain rifle rounds and certain velocities, and can be degraded and shatter, thus loosing effectivness.
Field dressings and putting pressure on a wound will slow bleeding and have a chance (decreasing depending on rate of bleeding) to stop it altogether. Morphine will work as an active pain relief but will slow the heart so must not be used all the time. Tourniquets and hemostatic agents like quik clot can be used although they will reduce a soldier's combat effectiveness, but will portentially save a life. Medics have the option to perform surgery, so procedures such as clamping arteries can be carried out to stop heavy bleeding. IV bags/plasma will refill a unit's "blood meter" which will come with obvious positive effects (due to blood loss having negative effects). CPR can be used on patients not breathing or without a pulse.
Medics will not carry magical "med kits" which do miracle surgery for them. But they will carry bags with the appropriate medical equipment in them. Smelling salts, IV bags, surgey kits, additional field dressings and tourniquets, hemostatic agents, AED (Automated External Defibrillator) for restarting the heart (FYI epinephrine is NOT used for cardiac arrest, giving a patient who has entered cardiac arrest after bloodloss due to a gun shot wound will only cause his heart rate to increase, increasing the speed at which he bleeds. It is used for bee stings and peanut allergies, maybe as a last resort in the military when someone is so obviously not going to survive that the medics just inject epi so they can say to relatives "well we tried to save him."
.. Ok this is an exageration but epi is an absolute last resort, should not be added to arma 3.) amonst other stuff like breathing apparatus.
This sounds very complicated, but can be made in a similar fashion to how ACE wounds were developed. ACE wounds have scripts that state whether the unit was or wasn't bleeding, then has scripts which give bleeding units side effects. Treatment is simple. If a unit has pain and morphine is used, pain is either completely taken away or atleast reduced. Diagnosis can be done in the same way "Examine > patient x is bleeding a requires bandages" is done, but with more authentic post-examination results, such as "patient unresponsive, is slowly oozing bright pinky red blood and is very pale, is not breathing and a pulse cannot be found." (cardiac arrest, artery has been severed, not breathing, unconscious and when they wake up they will obviously require pain relief

)
Everything I have just said is possible in arma 2 with a little motivation, knowledge on the topic (epi for gun shots wounds.. seriously

) and ofcourse, more contributers (sorry ACE I had to

), so it can deffinitly be made for arma 3. VBS has authentic ballistic simulation, artillary simulation (including targeting) and much more, so the excuse "this system is waaaay too complicated for a simple game" is obsolete.
Don't understand arty? Don't use it or try and learn to use it. Same goes with medics, I mean, it is a realistic simulation game..
And real life is much much more complicated. Here is all you really need to know for this new medical system:
Less serious bleeding is slowed and sometimes stopped by field dressings. Tourniquets and Quik Clot will clot bleeding much more effectivly but will cause pain and other negative effects.
Surgery can be performed by medics to achieve the best possible results, whether that be the patient is in the best possible condition after surgey or the surgery has the highest rate of success (compare a bandage to clamping a severed artery

).
Pain is treated by morphine although a unit cannot have too much and if the heart rate is already slowed down too much morphine will be dangerous.
Unconsciousness is treated by various things. If the unit has lost too much blood and has gone unconsciousness, they will require IV/plamsa to refill thier blood levels before baing capable of waking up, breathin will need to be restarted if it has stopped (obviously if they stop breathing they will dieg as well

). Smelling salts and bretahing apparatus (in medic kit) can be used to start the breathing of a patient.
Cardiac arrest will also kill a unit quite quickly although i can be treated with CPR, and AEDs.
Plasma/IV will refill the blood meter of a unit taking away all negative side effects of blood loss seeing as the blood has been replaced.
Oh and a simple medic module with vanilla arma 2 style damage could be added too although I think after using this system noone would go back. In arma, first aid is simple for soldiers, it is the medics job that is difficult, as it should be, just as an arty officer's job is not simply click on map with mouse and shoot super accurate arty.

VBS has great arty simlaution hope that makes it into arma 3 as well
My friends and I (one of them an ammunition designer for Thales Australia, one being a nurse and one being a doctor) would be more than happy to go into more detail with how proper wounds and medical treatment could be simluated to achieve maximum realisim and fun at the same time. I realise I wentinto a lot more detail about wounds than ammunition simulation, although ammunition is my favourite area of study, if you would like to know more, just PM me.