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In the US Air Force a NCO is a non-commissioned officer. This title carries the name Sergeant in it somewhere like Staff Sergeant, Senior Master Sergeant. The rank currently starts with the E-5 level. The levels below the E-5 carry the title Airmen in the name. During the Vietnam War E-4 was considered a NCO with just the title of Sergeant. After the War the Sergeant level moved to level E-5 and above. E-4 level was renamed Senior Airman.

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15y ago

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