uri ▁hel ic opter ; ▁this ▁was ▁the ▁longest ▁hel ic opter ▁deployment ▁undert aken ▁by ▁the ▁RA AF ▁to ▁that ▁time . ▁ ▁Due ▁to ▁the ▁need ▁to ▁reduce ▁defence ▁exp end iture , ▁the ▁Australian ▁government ▁decided ▁to ▁ret ire ▁the ▁Ch ino ok ▁hel ic op ters ▁in ▁ 1 9 8 9 . ▁Following ▁the ▁ret irement ▁of ▁the ▁Ch ino oks ▁on ▁ 3 0 ▁June ▁ 1 9 8 9 , ▁No . ▁ 1 2 ▁Squadron ▁was ▁dis band ed ▁on ▁ 2 5 ▁August ▁ 1 9 8 9 . ▁While ▁it ▁was ▁hoped ▁that ▁the ▁Army ' s ▁new ▁S - 7 0 A ▁Black h awk ▁hel ic op ters ▁could ▁ful fill ▁some ▁of ▁the ▁Ch ino ok ' s ▁roles , ▁this ▁was ▁not ▁successful . ▁As ▁a ▁result , ▁four ▁of ▁the ▁ex - RA AF ▁CH - 4 7 C s ▁were ▁upgrad ed ▁to ▁CH - 4 7 D ▁standard ▁and ▁assigned ▁to ▁' C ' ▁Squadron ▁of ▁the ▁Army ' s ▁ 5 th ▁A viation ▁Regiment ▁from ▁ 1 9 9 5 . ▁ ▁See ▁also ▁V ul te e ▁Ven ge ance ▁in ▁Australian ▁service ▁ ▁References ▁ ▁Notes ▁ ▁Bibli ography ▁▁▁▁▁▁▁▁ 1 2 ▁Category : Mil it ary ▁units ▁and ▁form ations ▁established ▁in ▁ 1 9 3 9 ▁Category : Mil it ary ▁units ▁and ▁form ations ▁dis est ab lished ▁in ▁ 1 9 8 9 <0x0A> </s> ▁William ▁Stanley ▁Mol