States Naval Academy, United States Merchant Marine Academy or in Naval Reserve Officers Training Corps units wear a gold fouled anchor device and have a gold chinstrap. Chief petty officers wear a cap badge consisting of a gold fouled anchor with silver block letters "USN" superimposed on the shank of the anchor, with the addition of one, two, or three stars at the top of the anchor if the wearer is a senior chief petty officer, a master chief petty officer, or the Master Chief Petty Officer of the Navy, respectively, and have a black chinstrap. Commissioned officers wear an officer's crest badge consisting of a silver federal shield over two crossed gold fouled anchors surmounted by a silver eagle and have a gold chinstrap. Additionally, officers of rank commander and captain have gold embroidered oak leaves and acorns on a black felt-covered visor, referred to as "scrambled eggs", with additional embroidery for flag officers. The covering fabric is khaki for use with the service khaki uniform or in white for use with blue and white uniforms (the use of blue fabric for use with blue uniforms was discontinued in 1963). Since October 2018 the same cap style is used by both males and females. Civilian usage Public safety officers, such as those from the police, fire department, ambulance service, and customs, often wear peaked caps, especially on formal occasions. In the US, police forces use caps that have softer tops and are not round and rigid in form (notable are those worn in New York and San Francisco). British and Australian policemen have a checkerboard pattern on the cap band, and traffic wardens often have a reflective yellow strip. A number of civilian professions—the most notable modern examples being merchant marine and civil aviation—also wear peaked caps. In such civilian old traditional usage, only captains aboard ships and pilots in command (airline captains) in service aboard aircraft, have the golden oak leaf motifs ("scrambled eggs") on the visor; this is in contrast to the naval tradition, where it is also worn by commanders (one rank below captain) as well as by commodores and flag officers. The original civilian variant of the peaked cap was widely worn by sailors and workers from the mid 19th century onwards. These were made of wool or canvas, and sometimes waterproofed with tar. During the 1960s, blue denim Greek fisherman's caps became an essential