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Enstarz'NCIS: LA' Season 6: When Will Callen's Name Be Revealed? Chris O'Donnell ...EnstarzNCIS LA; Chris O'Donnell (Callen) directing a season 6 episode (Photo : Twitter). NCIS: Los Angeles' G. Callen's past is a continuous mystery, but each season has slowly revealed more about the enigmatic agent. Who Is Leaving The 'NCIS: LA' Team?