Similar to me, I wanted to join the Air Corps but got a high test score.Helicopter pilot. I was told at the army recruitment office I didn't have enough O-levels. 17 years-old and had to leave home so decided to join up anyway and work my way up through the Army Air Corps. Took the tests and was told I had too high an intelligence score for the AAC. Told to become an Electronic Warfare Operator and learn russian instead. So I tried that. But, after a couple of months of being told what to do and shouted at all the time, I left and started digging ponds for a living.
I, sometimes, look up to the skies even now.
Went all they way to the final interview at Sutton Coldfield to be an electronics technician in the REME, but was then told there was no vacancies so I'd have to be a radio operator instead.
When I pointed out that I hadn't applied for that I was told, "off you go then, try again when you're eighteen."