first introduced to the buglers branch in 1935 for London duties. Civilian organisations The formal uniforms used by police forces were until the late 20th century mostly the same as the uniforms worn on ordinary duties but sometimes with various embellishments. The introduction of newer uniforms deliberately designed as workwear has left the older styles mainly used for ceremonial or formal purposes. The general formal style is a black jacket and trousers with a white shirt and a custodian helmet or peaked cap. A particular variation is that used by mounted police in Merseyside which can be observed when they escort the winner of the annual Grand National horse race at Aintree; this consists of the traditional Custodian helmet with an added white plume and silvered chinstrap; along with the style of tunic it bears more resemblance to a late 19th/early 20th century police uniform. United States U.S. Air Force In the mid-1980s, "ceremonial blue" uniform and "ceremonial white" uniform were introduced in the United States Air Force. The ceremonial uniforms were discontinued by 1 August 1994 and 1 March 1993 respectively. However, the United States Air Force Honor Guard are authorized to wear a ceremonial variant of the Air Force's service uniform. U.S. Army Prior to the 20th century, the uniforms of the United States Army were primarily made out of a combination of dark blue wool (for tunics or coats) and light blue (for trousers and breeches). After the adoption of olive drab and khaki uniforms in 1902, the US Army retained blue uniforms as its full dress until 1917. A modernised and simplified blue dress uniform was introduced in 1937. The blue full dress ceremonial overcoat was reintroduced in January 1929, and saw alterations to its design in 1936 and 1937, before it was suspended from use in 1943. The overcoat was reauthorized for use by officers in 1947, although it seldom sees use. The ceremonial overcoat with a white scarf is presently listed as an optional purchase item in the Army's uniform regulations, with general officers, aides-de-camp, and command sergeants major being authorized to wear it in formal ceremonial occasions during cold-weather conditions. In 1956, the Army introduced a blue service dress uniform, based on the full dress blue uniform. Presently, the Class A Army Service Uniform serves as the U.S. Army's equivalent to full dress. In November 2018, the U.S. Army announced the dress blue