Unit Colour Patches (or simply known as Colour Patches)[1] are worn on the Slouch Hat in the Australian Army to indicate which unit they are from. Unit colour patches are approximately 40mm x 40mm in size and have a large variety of colours and shapes on them.
While some are recent creations many date back to World War I, when on 8 March 1915 1 Division Order No 81 was issued at Mena, Egypt authorising their creation.[2]
The original series of colour patches was discontinued in 1949, and a new system was introduced in 1987 known as Series I and Series II colour patches.[3] The Series I range are known as the 'Heritage' patches and are the pre-1949 patches maintained in a register with the Series I 'Extended' and Series II range introduced during the 1990s.[4] [5] Both are used in the Australian Army due to some units tracing their lineage to the 1st AIF units. The Register also includes the patches for the Royal Australian Air Force and Royal Australian Navy patches.