Vance is notified by the Pentagon that the nuclear submarine Gibbs and Bishop are aboard to conduct a murder investigation has gone radio silent.
Did You Know?
The Silent Service, with respect to the episode title, refers to submariners, or Navy personnel who work in a submarine. See more
There is a female chief petty officer (the one performing CPR at the beginning of the episode) shown wearing a Navy SEAL "Budweiser" badge. As of the episode's air date, no woman has successfully begun, much less completed, Navy SEAL (BUD/S) training. Hence there are (currently) no female SEALs in the US Navy. See more
How does a U.S. Navy SEAL drown during a routine dive?
Leroy Jethro Gibbs
That's a good question.
References The Odd Couple