ɔːlðˈoʊ ðiːz tˈuː ˈɛɹkɹæft tˈaɪps wɜːɹ ɔːlɹˌɛdi kənsˈɪdɚd ˈɑːbsəlˌiːt æz fˈaɪɾɚz nˈoʊ. twˈɛnti fˈaɪv skwˈɑːdɹən wʌz tˈæskt wɪð pɹəvˈaɪdɪŋ ðɪ ˈɛɹ dᵻfˈɛns ʌv pˈɜːθ, ɐmˈɪd kənsˈɜːnz əvə pˈɑːsᵻbəl dʒˌæpənˈiːz ɪnvˈeɪʒən.
Although these two aircraft types were already considered obsolete as fighters No. 25 Squadron was tasked with providing the air defence of Perth, amid concerns of a possible Japanese invasion.