13/05/2026
Recently we acquired more Australian Womens Army Service (AWAS) uniforms for our WWII women codebreakers collection.
Alongside British WRNS and US WAVES uniforms these remind us how Australian women took on technical and analytical work while men were at the front. Among other groups University of Sydney students were recruited as AWAS operators, while academics helped in the early war cryptanalytic efforts at Fleet Radio Unit Melbourne or FRUMEL.
Around 600 women of the Australian Women's Army Service (AWAS) served at Central Bureau (CB), in a secretive tri-service intelligence unit comprising Australian, American, and British forces. AWAS grew into technical and intelligence-heavy positions, to manage the influx of Japanese signals intelligence (SIGINT) across the Southwest Pacific Area.
The scope of AWAS work at Central Bureau spanned the entire intelligence cycle, including intercepting Japanese Morse (Kana), traffic analysis, and cryptanalysis. They were primarily tasked with breaking tactical military and transport codes, most significantly the Japanese Water Transport Code.
AWAS staff operated IBM Hollerith punch-card machines, that enabled the women to sort, count, and cross-reference millions of intercepted code groups to find the "depths" or repetitions needed to break a cipher. Additionally, they used Typex cipher machines and specialized "kana" typewriters to transcribe intercepted Japanese messages. The sheer volume of messages in itself created a new intelligence source via the discipline of traffic analysis, obviously relevant to cyber / network security today.
Central Bureau’s most famous achievement was its pivotal role in the downing of Admiral Isoroku Yamamoto in April 1943. AWAS personnel were instrumental in processing and decrypting the specific signal that detailed the Admiral's precise flight itinerary, which allowed US P-38 Lightnings to intercept and destroy his aircraft. (On that note we have some nice items related to the Yamomoto mission but they are at the bottom of a pile in our storage, so we'll save that for another time).
For those interested to know more "The Secret Codebreakers of Central Bureau" by David Dufty is a good read.