start of deployment
Used in military, logistics, or organizational contexts to refer to the beginning of deploying personnel, equipment, or systems.
The start of deployment of the new missiles was announced.
The start of deployment of the system is scheduled for next month.
配備 is the noun 'deployment'; 配備開始 specifically refers to the start of that deployment.
開始 is a general term for 'start' or 'commencement'; 配備開始 narrows it to the start of deployment.
Compound of 配備 (deployment) and 開始 (start).