You can take a broad range of challenging courses while in ROTC; I double-majored in MechE and Physics, including a substantial research project involving travel to various astronomical sites.
In any case, I did not mention the obvious in my previous post: The first and foremost reason you join USAF/USA/USN/USCG is to serve your country. If you don’t feel that calling, go the civilian route. It is by far the best flight training in the world without question, but you are there to be a leader, get the mission accomplished no matter what at the far reaches of the world based on the needs of the service and the country.