military service
彼は兵役を免除されている。
He is exempt from military service.
でもその前に兵役が…痛かった？
But before that, there was mandatory military service... Did it hurt?
— ファニーゲーム (1997)
兵役のときの手紙よ
It's a letter from when I was doing my military service.
— アメリ (2001)
彼は兵役中は軍隊の厳しい規則に従っていた。
He followed the military's strict rules during his service.