I actually did, joined joined the Air Force 3 years later as soon as I turned 18. Only recently got out after 10 years. I was on holiday at the time with my family, and we saw the first news at at a train station when we were waiting for a connection. It had a tremendous impact on me at the time. Once we got to our hotel, we were glued to the TV 10 hours afterwards, and I can vividly remember the horror of watching replay after replay of those planes hitting the towers.