John Clark,
a.k.a. John Kelly gained his name in
Without Remorse when
John Kelly became a
fugitive from
Justice.
First introduced in The Cardinal of the Kremlin as Mr. "Clark", the Navy Seal proves time and time again that he is the best at covert operations, stealth infiltration and killing people and breaking their things. He teamed with Ding Chavez in Clear and Present Danger and this duo has saved the world more then once in their tour of duty, with Clark being the senior man.
Clark first appeared in The Cardinal and the Kremlin, and has been a recurring major character since.
John Clark is the feature character in:
Without Remorse
Rainbow Six