combat engineer; military engineer
Refers to a soldier who performs engineering tasks in military contexts, such as building bridges, fortifications, or clearing obstacles. Also used for the branch or activity itself.
工兵部隊が橋を架けた。
The combat engineer unit built a bridge.
彼は陸軍の工兵として地雷の除去に当たった。
He worked as an army combat engineer clearing landmines.