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Caps, Service, Wool, Serge, Olive-Drab (Specifications QMC 8-5D & 8-5E) & Caps, Service, Wool, Serge, Olive-Drab, Aviation Cadet (Specification QMC 8-5E Dated 12 December 1934).
Army National Guard approves wear of the tricorne 'minuteman' hat at formal events > National Guard > Guard News - The National Guard
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U.S. Army Corps of Engineers Headquarters > About > History > Historical Vignettes > General History > 031 - Headgear
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