But just like other examples of our wars in the middle east he grossly underestimated the resolve of the enemy and there was no clear exit strategy.
I don't think the military has under performed. It's bombed the crap out of its targets, sunk the navy.
What it can't do is fight a guerilla war without boots on the ground. Iran is vast. They are hunkered down and obviously prepared to fight this sort of war. And they've clearly also thought about strategy, the impact to the US and Israel of hitting the Strait of Hormuz and also hitting it's neighbours.
I think this paragraph by Pit probably sums it up... And it's not a failure of the military because I'd bet my house that many many many individuals warned about what has happened, but Hegseth and Trump in their ego-mania wouldn't listen. Drunk on the previous Iran strike and their military action in Venezuela. Both went off without any blowback or a hitch.