United States Department of the Air Force

The United States Department of the Air Force (DAF) is one of the three military departments within the United States Department of Defense. The Department of the Air Force was formed on September 18, 1947, per the National Security Act of 1947 (codified into Title 10 of the United States Code) and it is the military department within which the United States Air Force and the United States Space Force are organized.

Source: Wikipedia — United States Department of the Air Force (CC BY-SA 4.0)