Serv·ice cap or Serv·ice hat. Mil. A cap or hat worn by officers or enlisted men when full-dress uniform, or dress uniform, is not worn.
Note: In the United States army the service cap is round, about 3½ inches high, flat-topped, with a visor. The service hat is of soft felt of khaki color, with broad brim and high crown, creased down the middle.
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