Every situation is different. I knew a few people that were picked up in A-school and Power school and didn't leave until the completed prototype, but they were already in and almost done with school. They had to wait for their pleb summer anyways so instead of sitting around they just had them continue to do what they were doing. In your case I would assume they would just send you to the academy. I just wouldn't think they would waste the time and money to train you to just go to the academy and maybe end up doing something else. once you go to the academy and graduate you can do what ever you would like as far as being an officer and you don't have to be a nuke officer. So, I doubt they would send you to nuke school cause there just isn't any point to it.