Path (default)
C:\Program Files\2015\Men of Valor\VIETNAM\Save
file extension is .usa (lol)
Open (with Notepad) and scroll down to near the bottom, and locate these lines:
END_ACTOR
BEGIN_ACTOR=PlayerController0
Class=VietnamCharacters.PlayerCharacter Name=PlayerCharacter0
{
TimeTillNextBleed=1.505990
Weapon=WeaponCar27
WeaponCar15'op5_l4e.WeaponCar27'
Health=99999
Location=(X=-12843.373047,Y=8657.759766,Z=-283.085388)
Rotation=(Yaw=-9804)
If there is no Health value, add it! If it is there, modify it!
When closing, Notepad will ask you if you want to save the changes, click yes. Make a back-up copy 1st if you're paranoid, but you really don't need to.
When injured, remember to hold down "f" (default bandage key) and try not to run while bandaging (yea, right...they're shooting at you!) it slows down the process.

Also, do not search bodies unless it's for RPG-7! It seems if you do, it cancels the Health value modification, but I'm not entirely certain about that.
I don't know if it matters, but I always placed the Health value before "Location". Most other people use 9999 but I used 99999 in case I was getting hit by rockets. :Þ
This "cheat" always works fine for me. I dunno about your crashing troubles mate, I personally have been lucky I suppose...as I have never had the game crash. I did however, experience horribly corrupted graphics when I first entered the Admin Building, but I shut the game down and restarted and everything was OK. *whew* Good luck fellow soldiers, keep your heads down, crouch and aim...it's a much more successful tactic then the VC use running around yelling as they're firing at you...they rarely hit their target doing that, and I have found that I can take out 7-10 screaming machine-gun firing hostiles before I'm even hit 2 or 3 times...which is no big deal. You have 7-10 bodies to search now for health, if you need it since you'll probably be using the "cheat" I just detailed.