Which entities are included in the Department of the Air Force?

The Department of the Air Force encompasses the air, space, and cyberspace forces. This includes all aspects related to aerial operations, space operations, and cybersecurity initiatives. The focus on these three domains reflects the evolving nature of warfare and defense strategies. The Air Force’s responsibilities extend beyond traditional air combat, recognizing the importance of space as a critical domain for military operations and emphasizing the need for cybersecurity in modern warfare.

The other choices refer to entities or capabilities that are outside the specific functions and focus of the Department of the Air Force. The involvement of Army and Navy forces pertains to different branches under the Department of Defense, while land and naval forces or ground and air support units both imply a broader operational context that involves the army and navy, which does not fall under the Department of the Air Force's jurisdiction.