High Quality Content by WIKIPEDIA articles! Aircraft recognition is a visual skill taught to military personal and civilian auxiliaries since the introduction of military aircraft in World War I. It is important for air defense and military intelligence gathering. Aircraft recognition generally depends on learning the external appearance of the aircraft, both friendly and hostile, most likely to be encountered. A variety of techniques have been used to teach this information including scale models, printed silhouette charts, slide projectors, computer aided instruction and even specially-printed playing cards.

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