Final answer:
No private citizen has unrestricted access to any military branch's entire arsenal. The U.S. Army, Navy, Marine Corps, and Air Force each have their own arsenals, available solely to their authorized personnel.
Step-by-step explanation:
The branch of the military whose entire arsenal you have access to is the U.S. Department of Defense. It oversees the many elements of the U.S. armed forces, including the Army, Navy, Marine Corps, and Air Force.The branch of the military whose entire arsenal an individual has access to doesn't exist in terms of unrestricted access by private citizens.
In the United States, the military is comprised of the Army, Navy, Marine Corps, and Air Force, each with their specific roles and equipment. Only authorized personnel within the military have access to their respective branch's arsenal. However, the second amendment does talk about the right to own guns in the context of a 'well-regulated militia', which has been interpreted to refer to state entities like the National Guard, that provide support during national emergencies or foreign threats.