 Nave's unit was made up of a core of naval personnel, heavily assisted by university academics and graduates specialising in linguistics and mathematics (including from June 1941 a "cipher group" of four from Sydney University).These included Thomas Room, Dale Trendall, Athanasius Treweek, Eric Barnes, Jack Davies and Ronald Bond.The third group was a trio of British Foreign Office linguists (Henry Archer, Arthur Cooper and Hubert Graves), and Royal Navy support staff, evacuated from Singapore, particularly from the Far East Combined Bureau (FECB) there.