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An air force is the branch of a country's military which fights in the air. The air force is made up of aircraft such as fighters, bombers, helicopters and transport aircraft. When a navy has its own air force it is called Naval Aviation.
Aircraft in an air force sometimes fly in a formation. Formations are when the aircraft fly in a pattern. Air forces is part of the military.
- Daniel Slane. Report to Congress of the United States: China Economic and Security Review Commission. DIANE Publishing. p. 74. .