Half a million soldiers and 57,000 dead in Vietnam did not win the war, when you have an adversary who is willing to fight and has a supply line. The same applied to Afghanistan and Korea.
Russia is currently learning that lesson again. After Afghanistan, in the Ukraine, for the US to have any chance of winning in Iran the US needs at least half a million people on the ground. With a trillion dollar bankroll?
The United States is reaching the end. When it comes to the amount of money needed, let alone the human cost, and to top it off, while we’re slogging around in the sand in Iran at every level, we will be getting weaker in relationship to China and the world.