Conversation so far:
When did Robert Mueller serve with the Marines?
In the summer of 1968, he served in Vietnam as a rifle platoon leader as a second lieutenant with Second Platoon, H Company, 2nd Battalion, 4th Marines, 3rd Marine Division.
Did Robert Mueller receive any awards serving with the Marines in South Vietnam?
Mueller received a Bronze Star for heroism and a Purple Heart.
Did Robert Mueller serve in any wars?
Mueller served as a Marine Corps officer during the Vietnam War.
Was Robert Mueller known for anything else besides serving as a marine in the Vietnam War?
Robert Mueller is an American lawyer and government official who served as the sixth Director of the Federal Bureau of Investigation from 2001 to 2013.
Was Robert Mueller ever wounded?

Question: When did he retire?
Self-contained rewrite: When did Robert Mueller retire?