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There's no land campaign. It's an isolated series of strikes for PR reasons and wishful thinking about Iran collapse.

What happens when Iran responds by firing missiles on Israel or on a US ship and inflicts major casualties on either targets, though?

Exactly. See, sinking of the General Belgrano.

Even the US can't move an Iran sized invasion force overnight. It was a couple of years from 9/11 until the invasion of Iraq.