Conversation so far:
When did Chesley Sullenberger get involved with military services?
Sullenberger was appointed to the United States Air Force Academy, entering with the Class of 1973 in June 1969.
Where did he live when he was appointed?
CANNOTANSWER.

Question: How long was he involved in military services?
Self-contained rewrite: How long was Chesley Sullenberger involved in military services?