boy air cadet; youth aviation soldier
Historical term for a male cadet aged 14–19 in the Imperial Japanese Army Air Service during WWII.
His grandfather trained as a boy air cadet.
During the war, many youth aviation soldiers volunteered.
Compound of 少年 (shōnen, 'boy') + 飛行 (hikō, 'flight') + 兵 (hei, 'soldier'). A specific term from the WWII era.