Aircraft Recognition in The United States
In the US during World War II, civilians were enlisted into a Ground Observer Corps to support air defense operations, receiving training in aircraft identification.
The US military continues to use "WEFT" as a mnemonic for the major features of an aircraft: Wings or rotors to provide lift, Engines to provide power, a Fuselage to carry the payload and pilot, and a Tail assembly which controls the direction of flight. These elements differ in shape, size, number, and position. The differences distinguish one aircraft type from another. The individual components can be taught as separate recognition and identification features, but it is the composite of these features that must be learned to recognize and identify an aircraft.
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