 
 <prompt> Wetin be di branch wey USAF dey part of? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: The United States Air Force (USAF) na di aerial warfare service branch of di United States Armed Forces and one of di seven American uniformed services. Initially part of di United States Army, di USAF bin form as a separate branch of di military on 18 September 1947 under di National Security Act of 1947. E be di most recent branch of di U.S. military wey dem form, and e be di largest and one of di world's most technologically advanced air forces. Di USAF dey talk say dia core functions na Nuclear Deterrence Operations, Special Operations, Air Superiority, Global Integrated ISR, Space Superiority, Command and Control, Cyberspace Superiority, Personnel Recovery, Global Precision Attack, Building Partnerships, Rapid Global Mobility and Agile Combat Support. 