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You can't justify "retaliation" without "casualties".

Yeah according to the tweet above it said none of the missiles were stopped but at the same time no us casualties so I wonder if they evacuated before the attacks took place.

Duck and cover is the easiest type of missile defense and it works, especially on a military base where everyone is trained to do just this. It's cheap and effective and makes the attack seem pointless.
Spendong a few million dollars on patriot missiles which aren't going to cause that much danage doesn't make sense.

Iran told Iraq and Iraq told U.S. the attacks were coming. This was all pre planned so Iran could save face and show they retaliated against the U.S.