Conversation so far:
How did Chesley Sullenberger begin his military service?
Chesley Sullenberger was appointed to the United States Air Force Academy, entering with the Class of 1973 in June 1969.
What was Chesley Sullenberger's area of study?
What did Chesley Sullenberger do after he got his master's degree at Purdue University?
Following completion of Chesley Sullenberger's graduate degree at Purdue, he was assigned to UPT at Columbus AFB, Mississippi, flying the T-37 Tweet and T-38 Talon.

Question: What was his rank in the military?
Self-contained rewrite: What was Chesley Sullenberger's rank in the military?