When I was young, 22 years old, My rank of Japan Ground Self-Defense Force was Leading Private（LPT）. One of the duties was night watch inside the barracks.
It caught my eye in the line of duty. It was bulletin board. There was something written about technical land sergeant. One of them was an air traffic controller. I decided to take the internal selection examination of air traffic controller. The content of the examination was academic, aptitude, and interview.
I finally passed the examination. And I got an education of air traffic controller by 5th technical school of Japan Air Self-Defense Force in Komaki air base.
I got licensed of air traffic controller and promoted to sergeant.