It's never been entirely clear to me if Tom Cruise's character in A Few Good Men was really based on former US Attorney David Iglesias (a US naval reservist), or if that's just urban legend. But a documentary currently in production, InJustice, is most certainly based on Iglesias' story his wrongful termination by the Department of Justice and the huge scandal it caused.
No word on when the documentary will be finished and released (I've got an e-mail into the producer), but for now, here's the trailer: