I got chopped from flying even though I consistently scored the highest on my crewman course due to my attitude and behaviour, I was young and had no sense.
There were 5 of us and there were 2 x Chinook Postings, 2 x Puma and 1 x Wessex at Aldegrove for in-theatre training. I was allocated to Aldegrove and started my Ireland-specific training but 2 days before graduation I was hauled in front of the Crewman Leader and told that even if I passed the Final Handling Test, he couldn't pass me because of my 'Personal Qualities'.
I was put on review, hated my new instructor, and my confidence & ability disappeared, I was chopped and spent 3 months at Brampton in Support Command PhysEd before leaving.
My confidence was so dented I also never flew GA again until a family near-tragedy last year woke me up and I decided to start again, 17 years on.
My point is, that to succeed as a Military Flyer you need the ability, discipline, character and attitude, otherwise you are discovered and weeded out.