I am a core select. I go to a non-nuke school. They won't necessarily FORCE you to be a nuke, but you will have to go through service assignment. Service assignment typically comes back nuke if you are qualified for the job.
If you're a non-technical major with marginal Calculus and Physics grades you don't have anything to worry about.
If you're the opposite, be prepared. I've witnessed a lot of MIDN getting selected nuke against their will because of good grades and a technical degree. You can always turn it down, however, if you TRULY don't want to go.
I wouldn't worry about it too much. You'll be fine either way. Good luck!
Thanks for the great reply bryson! I have As andBs in calc physics, engineering math, organic chemistry and other technical courses. I actually qualified for nuke coming in, and am my current rating due to some recruiting mishaps. im quickly warming up to the idea of being a sub nuke, though.