Medical science has wondered that for years.
All that is left are pockets of lone soldiers with shoulder rockets and a few pick up launchable rockets parked in a garage.
There is no Iranian regime left but a few people hiding in bunkers afraid to come out making noise on Twitter while posting fake AI images on the web.
Strategically, Iran is done, if Trump wanted to, he could march in there and mop the place up, but he is doing an end-around establishing the new regime to step in soon to take power from the towelheads.