Which process involves developing a broad concept of sustainment?

The correct answer highlights the critical phase within the Military Decision Making Process (MDMP) where a comprehensive understanding of sustainment is developed. During the Course of Action (COA) Development Process, planners create various options for how to accomplish the mission, which includes considerations for logistics, personnel, and resources necessary to support those operations over time. This stage of planning is essential as it establishes a holistic view of the future operations and directly influences the success of the mission through effective sustainment strategies.

In this context, the other processes do not primarily focus on formulating sustainment concepts. While Mission Execution is about carrying out the plan developed, Operational Planning involves defining how the mission will be conducted at a broader strategic level, and Mission Assessment evaluates the effectiveness and outcomes of those missions rather than developing the sustainment concepts themselves. Therefore, the COA Development Process is central to generating a robust plan that adequately addresses the requirements for sustaining operations.