Why do PA State Troopers wear their hats with the chin strap under their lips instead of chin? And it's not only while wearing a ceremonial uniform. - Quora
History of the Campaign Hat United States Army Drill Sergeant Hats The current drill sergeant hat evolved from the 1883 campaign hat. That headgear was a modified (flat brim versus upturned brim)
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What's the story of the iconic National Park Service ranger 'flat hat'? | Golden Gate National Parks Conservancy
Missouri National Guard Citizen-Soldier dons drill sergeant hat > National Guard > Guard News - The National Guard
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