作さく戦せんオーバーレーMeanings1nounoperation overlayMilitary term for a transparent sheet placed over a map to show tactical information such as troop movements, boundaries, or objectives.作さく戦せんオーバーレーを使つかって、各かく部ぶ隊たいの進しん路ろを確かく認にんした。We used an operation overlay to confirm the routes of each unit.
