Which agency is primarily responsible for joint doctrine development in the U.S. military?

The Joint Staff is the agency primarily responsible for joint doctrine development in the U.S. military. This role involves creating and maintaining the foundational concepts, principles, and methodologies that guide the planning and execution of military operations across all services. The Joint Staff operates under the Chairman of the Joint Chiefs of Staff and facilitates collaboration among the different branches of the military to ensure a unified approach to joint operations.

Developing joint doctrine is essential for seamless interoperability among the Army, Navy, Air Force, Marine Corps, and Coast Guard, particularly during joint missions that necessitate integrated efforts. The Joint Staff's expertise in amalgamating inputs from various services ensures that the doctrine reflects the diverse capabilities and perspectives of each branch.

The other agencies listed, while integral parts of the military structure, do not hold the same responsibility for joint doctrine. The United States Army and Navy focus on their specific service doctrines and operations, while the Defense Logistics Agency primarily handles logistics and supply chain management across the Department of Defense. Therefore, the Joint Staff's unique position and mandate make it the correct answer for joint doctrine development.