According to DISTINGUISHING COLOUR PATCHES OF THE AUSTRALIAN MILITARY FORCES 1915-1951 by Keith Glyde:
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623.
Static Light Anti-Aircraft Units, 1943-1945: Author. GRO 672/1943, 17.9.1943. Worn by the following types of units: 112th and 114th Aust. LAA Regiments; LAA Batteries (Static); LAA Troops (Static).
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