Daddy-O
Ralph Waite who portrays Jethro Gibbs’s father, Jackson, is pretty impressive off-screen too. His character Jackson Gibbs is known to have been a World War II fighter pilot for the US Army Air Force. Moreover Mark Harmon’s real life father, Tom Harmon, also was a World War II fighter pilot for the US Army Air Force. Funny how life imitiates art.
Daddy O
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