Abby references Gibbs' rule no. 22: Never ever bother Gibbs in interrogation.
At the end, the SEAL commander, recognising Gibbs as a Marine, salutes him with "Oorah", a well known U.S. Marines battle cry, rather than the Naval "Hooyah".
Some of the SEAL CMDR's medals would be impossible for a man his age. Included on his ribbon rack is the Navy Korea Defense Service medal. Nevermind the fact that SEAL's were not even commissioned until the early 60's. There were however UDT(Underwater Demolition Teams) in Korea.