I want some of the good stuff you are using!
I'm sure US troops will be plenty terrified, and there will be lots of casualties, you just made that argument on my behalf so you could have something to win. The amount of fear or the level of sheer human carnage on either side does not affect the outcome. Like I said in my post, if these factors affect political will in the US, Iran will win, if not then US military will not take very long, despite the costs, to achieve victory. It will not be defeated on grounds of "drones", terrain, Iran being well prepared, or oil prices.
Unless this being a suicide mission isn’t the stated goal of the current US political leaders, but that’s another discussion.
Now imagine the same, just on a much larger scale...
The new technology (drones) changes the game quite a bit.