In the mod resistance & liberation you could surrender. when you surrenderd it was a personal choice like if your squad got killed you could drop your weapons and then become a POW. but the more immersive parts of when someone surrenderd is that you could go on a mission to save your squadmate or do a prisoner exchange. I also think that it could be implemented if you captured an enemy tank crew you would get 5 points and if you captured a high value target like the commander or a squad leader you could get like 10 or 15 points.