▁Women ' s ▁A ux ili ary ▁Australian ▁Air ▁Force , ▁Women ' s ▁Royal ▁Air ▁Force ▁( until ▁ 1 9 6 8 ) ▁and ▁Princess ▁Mary ' s ▁Royal ▁Air ▁Force ▁N urs ing ▁Service ▁( until ▁ 1 9 8 0 ) ▁was ▁" group ▁officer ". ▁ ▁The ▁equivalent ▁rank ▁in ▁the ▁Royal ▁Ob server ▁Corps ▁( until ▁ 1 9 9 5 ) ▁was ▁" ob server ▁captain ", ▁which ▁had ▁a ▁similar ▁rank ▁ins ign ia . ▁ ▁Notable ▁group ▁capt ains ▁▁ ▁Sir ▁Douglas ▁B ader ▁World ▁War ▁II ▁f ighter ▁pilot ▁and ▁double ▁am put ee ▁ ▁C live ▁Robert son ▁" K iller " ▁C ald well ▁, ▁Cross ▁of ▁Val or ▁( Pol and ) Austral ia ' s ▁highest - sc oring ▁f ighter ▁ace ▁and ▁the ▁highest - sc oring ▁P - 4 0 ▁pilot ▁from ▁any ▁air ▁force ▁and ▁the ▁highest - sc oring ▁Al lied ▁pilot ▁in ▁North ▁Africa . ▁B ec ame ▁one ▁of ▁a ▁small ▁group ▁of ▁pil ots ▁throughout ▁history ▁to ▁become ▁an ▁" A ce ▁in ▁a ▁day " ▁ ▁Leonard ▁Ch esh ire ▁World ▁War ▁II ▁bom ber ▁pilot ▁and ▁char ity ▁worker ▁ ▁Walter ▁Church ill ▁World ▁War ▁II ▁ace ▁f ighter ▁pilot , ▁who ▁also ▁evaluated ▁various ▁makes ▁of ▁f ighter ▁aircraft ▁for ▁the ▁R AF , ▁and ▁played ▁a ▁key ▁role ▁in ▁getting ▁Sp it fire ▁aircraft ▁to ▁the ▁defence ▁of ▁Mal ta ▁ ▁Bruce ▁Dick inson Front man ▁of ▁Iron