Air forces are military branches responsible for aerial warfare and defense. They operate various aircraft, including fighter jets, bombers, and transport planes, to protect a nation's airspace and support ground forces. Air forces conduct missions such as reconnaissance, air-to-air combat, and strategic bombing, playing a crucial role in modern military operations. In many countries, air forces are part of the larger military structure, often working alongside navies and armies. They also engage in humanitarian missions, disaster relief, and peacekeeping operations. Notable air forces include the United States Air Force and the Royal Air Force of the United Kingdom.