Comment by inglor

It absolutely can conquer Iran lol it's a much stronger much better funded army - the issue is _holding_ Iran and what the point actually is. Even in conflicts like Vietnam when the other side had a superpower backing them (or Afghanistan when the Soviets attacked it) the issue isn't grabbing the territory it's the fact holding territory doesn't actually accomplish much and the strategic goal (not having a nuclear theocracy there) isn't met long term.