insignia Uniforms In 1922, the colour of the RAAF winter uniform was determined by Air Marshal Sir Richard Williams on a visit to the Geelong Wool Mill. He asked for one dye dip fewer than the RAN blue (three indigo dips rather than four). There was a change to a lighter blue when an all-seasons uniform was introduced in the 1970s. The original colour and style were re-adopted around 2005. Slip-on rank epaulettes, known as "Soft Rank Insignia" (SRI), displaying the word "AUSTRALIA" are worn on the shoulders of the service dress uniform. When not in the service dress or "ceremonial" uniform, RAAF personnel wear the General Purpose Uniform (GPU) as a working dress, which is a blue version of the Australian Multicam Pattern. Aircraft Current inventory Armament Roundel and badge Originally, the air force used the red, white and blue roundel of the RAF. However, during the Second World War the inner red circle, which was visually similar to the Japanese hinomaru, was removed after a No. 11 Squadron Catalina was mistaken for a Japanese aircraft and attacked by a Grumman Wildcat of VMF-212 of the United States Marine Corps on 27 June 1942. After the war, a range of options for the RAAF roundel was proposed, including the Southern Cross, a boomerang, a sprig of wattle, and a red kangaroo. On 2 July 1956, the current version of the roundel was formally adopted. This consists of a white inner circle with a red kangaroo surrounded by a royal blue circle. The kangaroo faces left, except when used on aircraft or vehicles, when the kangaroo should always face forward. Low visibility versions of the roundel exist, with the white omitted and the red and blue replaced with light or dark grey. The RAAF badge was accepted by the Chester Herald in 1939. The badge is composed of the St Edward's Crown mounted on a circle featuring the words Royal Australian Air Force, beneath which scroll work displays the Latin motto Per Ardua Ad Astra, which it shares with the Royal Air Force. Surmounting the badge is a wedge-tailed eagle. Per Ardua Ad Astra is attributed with the meaning "Through Adversity to the Stars" and is from Sir Henry Rider Haggard's novel The People of the Mist. Music The "Eagles of Australia" is the official march of the RAAF and is played as a quick march when the RAAF bands