Ron Paul served in the USAF.
Perry — U.S. Air Force Pilot
“In the early 1970s, Perry interned during several summers with the Southwestern Company, as a door-to-door book salesman. “I count my time working for Dortch Oldham [President of the Southwestern Company] as one of the most important formative experiences of my life,” Perry said in 2010. “There is nothing that tests your commitment to a goal like getting a few doors closed in your face.” He said that “Mr. Oldham taught legions of young people to communicate quickly, clearly and with passion, a lesson that has served me well in my life since then.”[18]
Upon graduation, Perry was commissioned in the Air Force, completed pilot training, and flew C-130 tactical airlift in the United States, the Middle East, and Europe until 1977. He left the Air Force with the rank of captain, returned to Texas, and went into business farming cotton with his father.”
Wikipedia