Alan L. Rennick testified during the House of Representatives Committee on Armed Services, Subcommittee on Tactical Air Support in 1965. Here is part of his testimony:
Mr. Pike (from the House of Representatives): Before you went to Vietnam you were with the 615th Tactical Fighter Squadron at England Air Force Base, LA; is that correct?
Captain Rennick: Yes, sir.
Mr. Pike: What did you fly with them?
Captain Rennick: The F-100, sir.
Mr. Pike: And when you got to Vietnam, you stepped from an F-100 to an A-1E; is that correct?
Captain Rennick: Yes, sir.
Mr. Pike: Were there any F-100’s in Vietnam at that time?
Captain Rennick: I don’t know if they actually were in the country, Sir. However, I do know that they were not striking until sometime in February.
Mr. Pike: They weren’t using F-100’s when you went to Vietnam?
Captain Rennick: No, sir.
Mr. Pike: So you stepped back from a jet plane to a prop plane; is that correct?
Captain Rennick: Yes, sir. It was a fancy sidestep.
Mr. Pike: Having had the experience in both the F-100 and the A-1E, would you care to make any comments on what you would rather be flying in close air support operations?
Captain Rennick: I would rather be flying the F-100, because it has an air-conditioned cockpit.
For the full text of the hearing see the following link. Alan Rennick’s testimony starts on page 4679. https://books.google.com/books/id=yP4cKlMxjFoC&pg=PA4679&lpg=PA4679&dq=%22alan+l+rennick%22&source=bl&ots=bWfUyeyBkG&sig=ACfU3U0kqmZvKFHsN_-5tPUhn_Y3ntFtWg&hl=en&sa=X&ved=2ahUKEwi8-vuGkpzmAhUFhOAKHYQGAAcQ6AEwAXoECAkQAQ#v=onepage&q=%22alan%20l%20rennick%22&f=false)