Who is responsible for organizing, training, equipping, and providing administrative and logistic support for services?

The correct answer is that the military departments are responsible for organizing, training, equipping, and providing administrative and logistic support for the services. Each military department—Army, Navy, Air Force, and Marine Corps—has distinct roles and responsibilities outlined in U.S. law, particularly Title 10 of the U.S. Code. This legislation establishes the framework within which these organizations operate, ensuring that each branch maintains its ability to perform its mission effectively and efficiently.

The responsibility for logistics and administrative support primarily falls to the military departments, allowing them to tailor their approaches based on the specific needs and capabilities of their respective services. This includes the provision of personnel, equipment, and resources necessary to conduct operations.

In contrast, the Secretary of Defense serves as the principal assistant to the President in all defense matters but does not handle the day-to-day organization and training directly. Combatant commands are primarily focused on the operational command and control of forces in specific geographic or functional areas, while Joint Operations Command, which typically refers to unified actions across multiple services, depends heavily on support from the individual military departments to fulfill its missions and objectives.