Ken Scott
After all he left the AAC to continue his flying career, presumably because the army considers flying to be a job for NCOs & only a part time distraction for officers. From his biog he seems to have spent much of his flying career away from the AAC either as a QFI or TP so it could be argued that he has achieved success both in aviation & as an astronaut despite his background rather than because of it.
Oh dear! Chip alert!