US Air Force: A branch of the United States Armed Forces, headquartered at The Pentagon, Arlington, Virginia. Its primary mission is to "fly, fight, and win... airpower anytime, anywhere," ensuring global vigilance, reach, and power. Key activities include air superiority, global strike, and rapid global mobility. As the world’s largest air force, this governmental body is central to national security and is significantly investing in the Next-Generation Air Dominance (NGAD) programme to develop sixth-generation fighter aircraft and advanced combat systems.