An imprisoned man known as the "20th hijacker" in the 9/11 terror attacks is asking a South Florida federal judge for a transfer to the military prison at Guantanamo Bay, Cuba. The request is part of a rambling, handwritten letter filed Wednesday in Miami federal court by Zacarias Moussaoui. He is serving a life prison sentence after pleading guilty in 2005 to conspiring with the Sept. 11 hijackers to kill Americans.