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The Royal Air Force (RAF) is the United Kingdom's aerial warfare force. It was formed towards the end of the First World War on 1 April 1918. Following victory over the Central Powers in 1918 the RAF emerged as, at the time, the largest air force in the world. Since its formation, the RAF has taken a significant role in British military history. In particular, it played a large part in the Second World War where it fought its most famous campaign, the Battle of Britain.

The badge of the Royal Air Force is the heraldic emblem used to represent the RAF which features an eagle superimposed on a circlet which is surmounted by a crown.

The badge was based on a design by a tailor at Gieves Ltd of Savile Row. It was first used in August 1918 and the original circlet showed a garter and buckle. The present plain circlet dates from 26 January 1923 when the badge was registered at the College of Arms and, it being noted that the garter and buckle were heraldically incorrect, a substitution was made.

In heraldic terms it is: "In front of a circle inscribed with the motto Per Ardua Ad Astra and ensigned by the Imperial Crown an eagle volant and affronté head lowered and to the sinister."Although there have been debates among airmen over the years whether the bird was originally meant to be an albatross or an eagle, the consensus is that it was always an eagle.

This coin commemorates the 100th anniversary of it's creation.