A campaign hat is a broad-brimmed felt or straw hat with a high crown that is pinched symmetrically at the four corners, also referred to as the Montana crease. This hat is also knows as a campaign cover, drill instructor cover, drill sergeant hat, lemon squeezer, Montana Peak, Mountie hat, ranger hat, sergeant hat, Scouts hat and Smokey Bear.

The origins of the hat can be traced to the 1840s when U.S. Army mounted troops posted to the far-west sometimes wore wide-brimmed civilian hats, which were more practical than the regulation shakos and forage caps then issued. The crease was influenced by the designs of the sombreros worn by the Mexican Vaqueros. The name started to be used after the 1872–1876 regulations which introduced a black felt hat — which could be drab after 1883 — for fatigue use derived from the types popularized during the American Civil War. Some were worn with campaign cords, mainly as a form of decoration.

At least as early as 1893, hats of the Stetson Boss of the Plains type were being creased into pointed tops by British South Africa Company (BSAC) scouts in Africa. When designing the iconic uniform for Boy Scouts, Baden-Powell drew on the hat worn by Frederick Russell Burnham, the celebrated American scout, during his service as Chief of Scouts in the BSAC and the British Army in the 1890s. The 1,200 Canadian troops serving under Baden-Powell were the first to wear the campaign hat as a part of their official uniform, and this very likely influenced Baden-Powell's decision to order 10,000 of the hats for the British troops.

By the 1930s the felt was made very stiff with a permanently flat brim. Due to the frequent wearing of helmets in France in World War I, most troops received a copy of the French bonnet du police that became known as the overseas cap. In 1942 the campaign hat ceased to be issued generally, but it was still commonly found in the Pacific theatre for much of the war, and was the trademark of General Joseph Stilwell.

Source: Campaign hat from Wikipedia

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