In the tense thriller The Guest, David appears at a family home claiming to be an ex soldier and colleague of the family's dead son Caleb. The family has a photograph of the military unit which appears to validate David's story as someone resembling him is in the picture alongside Caleb.
But later events in the movie, including the military denying that anyone with his identity is still alive, cast doubt on his story. Also, David tries to destroy any witnesses who could identify him despite having told them who he claimed to be.
Was David who he claimed to be?