FILE - This 1977 file photo, shows U.S. Navy bus driver John Robert Ball, 29, of Madison, Wisconsin. Ball was one of two sailors who died in a terrorist attack in Puerto Rico on Dec. 3, 1979. He was a top-secret communications expert, simply taking his turn behind the wheel, his father said. Ball's widow Patty said she was living in Puerto Rico with her husband and their two children as part of his three-year assignment when the attack occurred. (AP Photo, File)