I'm not saying it can't be. I'm saying I don't believe Iran has the capabilities or stockpiles available to do so, given the other American assets in theatre, or a desire to risk killing American troops.

I suspect they're deploying THAAD because of the failures of David's Sling during the last missile attack.

Air defense systems protect specific targets, not countries. Given the THAAD's long track record under US operators, I would wager that the bases and targets that Iranian missiles hit, either lacked sufficient coverage, had poorly trained Israeli personnel, and/or were covered by David's Sling.

Of course, I could be wrong, but we won't know for many many years given how secretive Israel is on these matters.

Edit: I'm not seeing any reports of active THAAD deployments in Israel prior to this announcement, just previous deployments to Israel, including for training. But no mention if they rotated out prior to the Iranian missile strike, or that they were present for it.

I'm not saying they weren't there, but do you have a source confirms they were present during this most recent attack?