It's an interesting concept.
In my former life, I was an enlisted fireman going through nuke MM "A" school. You had to graduate "A" school with at least a 2.75 to pass on to power school but a 2.50 would be good enough to pass the course and get you "push button" 3rd class crow. There was constant talk about what grades you had to get in order to "shoot the gap" between 2.5-2.75, get promoted and not have to go to power school. Those efforts were successfully squashed when they took a kid to mast for shooting the gap and found him guilty of dereliction of duty. He went from a frocked 3rd class to fireman recruit.
I passed MM "A" but was a week 5 auto-drop from power school. My grades were so bad that I did not even get a board. Then I went up to Groton for BESS, A-gang school, and I put in a package for ROTC and the USNA while at the school house. I learned enough additional math at nuke school to put my SAT well into the 1400's and I got picked up for both programs and decided on Texas over the Academy. Good choice.
They can't MAKE you go nuke, can they? Don't you have to go in for the big interview and everything? Seems if you go in and say that you have no interest in being a nuke officer, they would be pretty stupid to select you for it.