ɪn ɐ dˈaɪəətʃi, ðə sˌiːdˌiːˈɛf sˈɜːvz æz kˈoʊtʃˈɛɹmən ʌvðə dᵻfˈɛns kəmˈɪɾi, kəndʒˈɔɪntli wɪððə sˈɛkɹətɹi ʌv dᵻfˈɛns, ɪnðə kəmˈænd ænd kəntɹˈoʊl ʌvðɪ ɔːstɹˈeɪliən dᵻfˈɛns ˌɔːɹɡɐnəzˈeɪʃən.
In a diarchy, the CDF serves as co-chairman of the Defence Committee, conjointly with the Secretary of Defence, in the command and control of the Australian Defence Organisation.