noun
marching order; order to advance; go-ahead
Primarily a military term for an order to move forward or attack. Figuratively, it can mean a signal or permission to proceed with a plan.
司令官は部隊に進撃命令を下した。
The commander gave the troops the order to advance.
社長から新プロジェクトへの進撃命令が出た。
The president gave the go-ahead for the new project.
Compound of 進撃 (advance, attack) and 命令 (order, command).