Folks, there are very strict conditions under which a Navy ship can use weapons, and some unknown aircraft isn't gonna be a situation that they're going to open fire. You could be shooting some moron in an ultralight or some kids science project or whatever.

The US Navy is a professional organization, not some scared cops who shoot first and ask questions later.

Edit: I'm done here, but please stop all the military fantasy where everything is a threat and needs to be shot. This was like 50 miles from the coast of the USA, not Iran or NK.