The Great Impostor

The Great Impostor is a 1961 American comedy-drama film based on the life of Ferdinand Waldo Demara, starring Tony Curtis as the titular character. Born as Ferdinand Waldo Demara, he joins the U.S. Army, fakes his credentials, and assumes various identities, including those of a U.S. Marine, a doctor, and a teacher. Demara's exploits eventually lead him to the Royal Canadian Navy, where he becomes a doctor and is hailed as a hero for his services in Korea. After being exposed, he is pursued by the FBI, who ultimately track him down.