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air force	An air force is a group of people who fight like an army but fight in the air instead of on land. An air force uses airplanes and other machines that travel through the air.
captain	an officer of the U.S. Army, Air Force, or Marines, holding the rank just below major. [1/7 definitions]
colonel	an officer in the U.S. Army, Air Force, and Marines who ranks above lieutenant colonel and below general.
corporal²	an officer in the U.S. Army, Air Force, or Marine Corps who is ranked below sergeant and above private first class.
military	The military is the armed forces. The military includes all the different fighting forces of a country, such as the army, the navy, the air force, and the marines. [1/3 definitions]
sergeant	a rank above corporal in the U.S. Army, Marine Corps, or Air Force. [1/3 definitions]
service	"The service" is another way to talk about a country's armed forces. If someone is "in the service," it means they are a part of the army, navy, air force, or marines. [1/9 definitions]

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