Trump said when asked if war is brewing in the Persian Gulf following soaring tensions over last week's US drone shoot down by IRGC forces: "I hope we don't but we're in a very strong position if something should happen," as cited in Reuters. "I'm not talking boots on the ground," he added. "I'm just saying if something would happen, it wouldn't last very long."
This suggests a scenario similar to the Trump White House's two instances of tomahawk missile and air strikes on Syria of the past two years — the last which came in April 2018, and saw a night of sustained strikes involving a little over 100 tomahawk missiles launched from nearby warships.
That single night attack which primarily targeted Damascus leveled government buildings and sites the US claimed were for chemical weapons research and development. It was a mere months after this last Syria attack that Trump began announcing his desire for a "complete" American troop withdrawal from Syria.
Thus it appears that should things escalate to direct US military assault on Iran, it would (at least initially) take place in the manner of a "one and done" major fireworks display — the idea being to "hit hard," declare victory, and get out fast... at least in Trump's ideal version of how things would play out.