What is NOT one of the five specific functions of the US Space Force?

The correct answer is that conducting air supremacy operations is not one of the five specific functions of the US Space Force. The Space Force's primary roles focus on maintaining strategic access to and operations within space. These include ensuring the freedom of operation in space, deterring aggression in that domain, and providing rapid and efficient space operations to support national interests.

Air supremacy operations, however, are traditionally associated with the Air Force and involve control of airspace above the Earth's surface, targeting capabilities and combat mechanisms that relate specifically to aerial operations rather than space. The Space Force, formed in 2019, is dedicated to the domain of space, which includes satellite operations, missile warning systems, and developing new technologies for space warfare and defense. Thus, air supremacy is outside the scope of the Space Force's designated duties.