William Ryan

William Ryan was a Colonel in the United States Marine Corps and a former commanding officer of Marine Gunnery Sergeant-turned-NCIS Special Agent Leroy Jethro Gibbs.
==Biography==
===Pre-Series===
===NCIS Season 1===
==Personality==
==Physical Appearance==
Category:Americans in NCIS
Category:One-Off NCIS Characters
Category:Marines in NCIS
Category:Marine Colonels in NCIS
Category:Criminals in NCIS