Speaking of obvious limits, my father-in-law served in Vietnam, and the "limitations" were more than just at the strategic level, but at the tactical level as well. During the middle of a battle he was tasked to get more artiliary ammunition as they were severly running low in the field. He found a huge supply at his base, but when he was loading it up he was asked who it was for. He stated it was for an American artilary unit, to which he was told he couldn't have that ammunition because it was slated for the South Vietnam army to use. There was no other artilary ammunition available at the base because the American were fighting and using all their supplies, where as the South Vietnam army was always running away in battle so their supplies never got used. But those running the war kept allocating supplies to the South Vietnam, so it was quite common that our troops went without adequate ammo because of how supples were being allocated. So my father-in-law, having had enough of this ridiculous supply allocation, told them he's taking the ammo, and they'll just have to do to him whatever they need to do to him, but he's not going back to his buddies who are in battle empty handed. He left with the ammo assuming he was going to prison for his action, but nothing ever happened to him.