The USAF service cap is also worn by the Air Force's civilian auxiliary, the Civil Air Patrol. Senior members (those over the age of 18 who are not cadets and everyone over 21) may wear the service cap with the CAP-specific service cap device. Similar to the Air Force, company grade officers (and NCOs) wear the service cap with a plain brim, field-grade officers wear the service cap with two sets of clouds and bolts on the brim, and general officers wear the service cap with three sets of clouds and bolts. Cadet officers of the CAP also have the option to wear the service cap with the distinctive CAP cadet officer service cap device. The brim is always plain black leather or polymer, regardless of the cadet's rank. The service cap may also be worn by cadets of a CAP Honor Guard detail, even if they are not cadet officers. The manner of wearing is identical to that of a cadet officer.