kepi
A kind of hat that has a flat top and cylindrical in shape, with a visor. This hat is mainly associated with the French forces, with its use going back to the 1850s. Many countries used it in the late 19th to early 20th centuries (including France, Japan, Brazil, Austria-Hungary, Romania, and Italy). Philippe Petain and Charles de Gaulle wore one in their official portraits during WWII.