A person belonging to the armed forces who fights or defends; often refers to infantry or army soldiers but can mean military personnel in general.
戦争史の本には普通戦時の兵士の生活が詳しく書かれている。
Books on military history often describe soldiers' lives during wartime in detail.
彼は若いころ兵士として国外に派遣されたことがある。
He was once deployed abroad as a soldier when he was young.
部隊の兵士たちは厳しい訓練を毎日受けている。
The soldiers of the unit undergo tough training every day.