Tom Cruise not only thinks he trains harder than Olympic athletes, he believes his job as a professional actor is as grueling as fighting the war in Afghanistan -- this according to legal docs obtained by TMZ. As we reported, Cruise recently sat for a deposition in his $50 million libel suit against a magazine publisher that claimed he abandoned daughter Suri -- and his quotes are GOLD. First, the Middle East -- Tom says his location shoots are just like serving a tour in Afghanistan, "That's what it feels like. And certainly on this last movie, it was brutal....