Actually there's only 4 specializations per faction for medical department (medic is KDF only, nurse is Fed only).

Still...here's a solution that would be less work for the devs and make the players more happy:

Let us pick which sub-department the doff vendors give, so instead of the 4 choices:
random, tactical/security, engineering/operations, and science/medical

we have instead 8 choices:
random, tactical, security, engineering, operations, science, medical, civilian