FM 11-25 - Ibiblio 2026

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The document is the FM 11-25 Signal Corps Field Manual for the Aircraft Warning Service, published by the War Department in 1942 and updated in 1943. It outlines the purpose, organization, and operational procedures of the Aircraft Warning Service, which is responsible for detecting and reporting enemy aircraft to ensure air defense. The manual details various components such as military and nonmilitary agencies involved, communication systems, observation methods, and the roles of personnel including observers, controllers, and radar operators. It emphasizes the importance of timely reporting and coordination among different units to effectively manage air defense operations.

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