Clayton "Clay" Jarvis was a politician and a Secretary of the Navy.
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- Jarvis was played by Matt Craven, a Canadian actor who also originally worked alongside Rocky Carroll (Leon Vance) in the movie, "Crimson Tide". In addition, Craven is also the first-ever Canadian actor to play the SECNAV role in NCIS with Leslie Hope who played Jarvis's successor, Sarah Porter also originally hailing from Canada.
- Jarvis is also the first SECNAV in the entire NCIS series to have been killed in the line of duty as all his fellow predecessors presumably either retired or subsequently resigned from their position as SECNAV.