Do Retired Marines Still Use the Phrase "Semper Fi?"

In a video on the subject from the Marine Corps website, one Marine says, "There's no such thing as an ex-Marine, no such thing as a former Marine. Once a Marine, always a Marine." Active and retired Marines alike adhere to the principle inherent in the phrase itself and see their loyalty as a lifetime commitment. They may use the words "Semper Fi" as a way of addressing other Marines.