How do you get submarine disqualified?

Answer 1

There are quite a few different ways, but the screening process is pretty rigorous, so it doesn't happen that often. However, the most common is a medical DQ. Submarines aren't exactly the most healthiest of places to work (I was medically DQ'd for Asthma after 5 years aboard my boat), and medical DQ's happen more than is commonly known. If problems don't get you while you're on active duty, something usually crops up after you leave the Navy.

Other ways are losing your security clearance (you need a minimum Secret clearance to be a crewmember), psychological problems (doesn't happen that often since they can't tell the wackos from the normal submariners, at least not easily), accidents, suicide, or major disciplinary infractions (drugs, etc.).