Which principle focuses on concentration of effort under one responsible commander?

• A. Unity of Effort
• B. Mass
• C. Unity of Command
• D. Offensive

Answer: (C)

Unity of Command means every unit operates under a single responsible commander who has the authority to direct all military actions. This setup ensures a clear chain of command and a single, unambiguous direction, so the entire effort is coordinated without conflicting orders. It directly supports concentrating effort under one leader, which is why it’s the best fit for this idea. The other terms describe related ideas but in different ways: Unity of Effort is about coordinating actions across multiple organizations toward a common goal, not about a single commander; Mass refers to concentrating combat power, but not necessarily under one commander; Offensive is about a type of operation, not how command is structured.