ɪn ˈɜːli nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi wˈʌn, nˈoʊ. twˈɛnti wˈʌn skwˈɑːdɹən, ðə skwˈɑːdɹən wʌz ɹˌiːdˈɛzɪɡnˌeɪɾᵻd ɐ fˈaɪɾɚ jˈuːnɪt ænd wʌz sˈɛnt tə sˈɛmbɐwˌæŋ tə ɹˌiːɪkwˈɪp wɪððə bɹˈuːstɚ bˈʌfəlˌoʊ.
In early 1941, No. 21 Squadron, the squadron was re-designated a fighter unit and was sent to Sembawang to re-equip with the Brewster Buffalo.