http://www.navydep.com/forums/showthread.php?t=2320
http://www.navydep.com/forums/showthread.php?t=2442
http://www.navydep.com/forums/showthread.php?t=2164
http://www.navydep.com/forums/showthread.php?t=1988
The above threads tell you ALL about special physicals for Nukes and the other rates which have them.
The other special nuke stuff is just seeing the Nuclear coordinators a few times while you're at boot. That office is like heaven compared to being with your division though, I'll tell you what.