Submarines/SEALs/EOD/Diver are all strictly voluntary, meaning the Navy cannot force you to go in to any of these communities...
As are flight orders. Which begs the question, what CAN they make you do in the Navy? SWO?
Also, the phase, "With all due respect" was mentioned earlier. Either what you're about to say IS respectful and needs no qualifier, or it's NOT respectful, and you shouldn't say whatever it was anyway. Disagreeing with a superior on any matter is not inherently disrespectful, it just needs to be handled appropriately and with tact, i.e. in private, using facts not emotions, and STFU once told the final decision.
Try something along the lines of,"Sir, I appreciate the needs of the Navy and will do my best in whatever community I am assigned, but I believe I will be able to serve better in a field that I have an interest in, such as SNA/SNFO/SWO/field X."