Your idea is that America only has an airforce and can't do anything other than bombing?
I don't know where you get this idea, did you stop reading the news? Did you see that they conquered Venezuela in three hours?
The current task for the US military is to open the straits of Hormuz. How much of a ground force will be necessary (if any) is unclear, but we will see. Incidentally America is the
only military in the world that can currently do large scale
combined arms operations.
The US military won the Iraq war easily. The problems came when brain-dead politicians made bureaucratic decisions that were completely disconnected from reality,
as dramatized by Matt Daemon. If America fails in Iran, it will be for the same reason. Given Trump's tenuous connection to reality, that's a real risk.