What is defined as a group of tasks and systems unified by a common objective to accomplish missions?

The correct response is the definition of War Fighting Functions. These functions represent the core capabilities and tasks that are necessary for military forces to conduct operations successfully. Each function encompasses a specific set of tasks and systems that work in concert to achieve the overall mission objectives.

War Fighting Functions include key areas such as command and control, maneuver, fires, intelligence, protection, and sustainment. By unifying these diverse tasks under a common objective, military operations can be effectively planned and executed, ensuring that forces leverage their full capabilities in pursuit of success on the battlefield.

In this context, the other options do not accurately capture the essence of the definition provided. Military Strategies refer more generally to the overarching plans designed to achieve national objectives but do not focus on specific tasks or systems. Operational Assets denote the resources available for missions but do not imply cohesion around a common objective. Defense Mechanisms typically refer to systems or methods for protecting against threats but lack the comprehensive nature of unifying tasks and systems aimed at mission accomplishment that War Fighting Functions embody.