A former US Marine has claimed he spent 17 years of his career on planet Mars. The former-naval infantryman, who uses the pseudonym Captain Kaye, says he was dispatched to the Red Planet to protect five human colonies from native Martian life forms. He claims he then spent almost three years serving in a secret 'space fleet' run by a multinational organization called the Earth Defense Force, which recruits military personnel from countries including the US, Russia and China. Here's the video.