Department of the Air Force in the context of "Chief of Space Operations"

The United States Department of the Navy (DON) is one of the three military departments within the United States Department of Defense. It was established by an Act of Congress on 30 April 1798, at the urging of Secretary of War James McHenry, to provide a government organizational structure to the United States Navy (USN). Since 1834, the department has exercised jurisdiction over the United States Marine Corps (USMC), and during wartime the United States Coast Guard (USCG). These branches remain at all times independent and coequal service branches within the DON. It is led by the secretary of the Navy (SECNAV), a statutory civilian officer.

The Department of the Navy was an executive department, whose secretary served on the president's cabinet, until 1949, when amendments to the National Security Act of 1947 established the Department of Defense as a unified department for all military services; the DON, along with the Department of the Army and Department of the Air Force, became a component of the DoD, subject to the authority, direction and control of the secretary of defense.

The secretary of the Army (SA or SECARMY) is a senior civilian official within the United States Department of Defense, with statutory responsibility for all matters relating to the United States Army: manpower, personnel, reserve affairs, installations, environmental issues, weapons systems and equipment acquisition, communications and financial management.

The secretary of the Army is nominated by the president of the United States and confirmed by the United States Senate. The secretary is a non-Cabinet-level official, subordinate to the secretary of defense. This position was created on September 18, 1947, replacing the secretary of war, when the Department of War was split into the Department of the Army and Department of the Air Force.

The United States Space Force includes the Space Staff, the field commands, space deltas, and squadrons.

The Space Force is organized as one of two coequal military service branches within the Department of the Air Force, the other being the United States Air Force. Both services are overseen by the Secretary of the Air Force, who has overall responsibility for organizing, training, and equipping the Air Force and Space Force.