Which staff position is S-3?

• A. Administrative Officer
• B. Security Officer
• C. Operations Officer
• D. Logistics Officer

Answer: (C)

In Army staff structure, S-3 designates the Operations Officer, the person who plans, coordinates, and oversees all unit operations and training. This role is the heartbeat of mission execution—developing operation orders, scheduling drills and exercises, and ensuring the unit can carry out missions as directed. The S-3 serves as the main link between the commander and subordinate elements during both planning and execution, aligning movement, maneuvers, fires, and reconnaissance into a coherent plan and then tracking readiness and performance.

An Administrative Officer focuses on personnel and administrative tasks, a Security Officer handles security and intelligence functions, and a Logistics Officer manages supply, maintenance, and transportation. Since S-3 is specifically tied to operations and training rather than personnel, security, or logistics, it clearly points to the Operations Officer.