Lieutenant "Doc" Rios was the independent duty corpsman assigned to the USS Nathan James (DDG-151). In Season 3, he was promoted to Ensign in the US Navy Medical Corps and made Chief Medical Officer of the Nathan James. He was captured by pirates as a P.O.W. and was rescued.
Sometime prior to the events of Season 5, Ensign Rios rose to the rank of Lieutenant.
Lieutenant Rios was killed in the Fleet Week attack after he attempted to give medical aid to the wounded Captain Garnett.
In the series finale, LT Rios is one of the characters with whom Tom had served (most of them deceased,) who appears in his hallucination as he is drowning, after Nathan James sinks ramming Gustavo's Battleship in order to end the war with Gran Colombia. Tom views, and then is part of, an award ceremony for him, which also serves as a change of command ceremony for Nathan James. When President Michener asks Tom if he is ready to be relieved (as commanding officer,) Tom hesitates and wonders aloud who he is passing responsibility onto. Rios is one of the sailors in the audience for the ceremony (who are also Tom's close friends and allies,) stand and declare that they have the watch, allowing Tom to finally achieve peace and be able to mentally and emotionally let go of both Nathan James, and of the burdens he has carried around since the plague began, secure in the knowledge that others will always be there.
Ultimately, Tom decides to keep fighting, swim to the surface, and live.
He is portrayed by Maximiliano Hernandez.
Awards and Decorations
The following are the medals and service awards seen worn on Rios's uniform in the show. Rios received the Bronze Star for his actions during the Red Flu crisis.