You remember when I told you that he never talk to anyone? As no one ever encountered him talking to anyone. He was always busy in his work at the academy. Not just the academy, he even hardly talk to anyone from his family. No one ever saw him talking on phone. His personal life was covered with a mystery that no one had any idea of. You will know well, if and when you encounter with a military official. You can tell that by his appearance and his body structure. Same was with Bill. Anyone from his looks could tell that, he was a “retired military”.
William was never bothered by people not giving him any attention, or people finding him mysterious. All he wanted was to work with full dedication and add to his personal plans.