- 4 ▁Sky h awk ▁train ers . ▁These ▁aircraft ▁were ▁the ▁first ▁newly ▁built ▁Sky h aw ks ▁to ▁be ▁sold ▁to ▁a ▁country ▁other ▁than ▁the ▁United ▁States . ▁ ▁The ▁Australian ▁Sky h aw ks , ▁which ▁were ▁designated ▁the ▁A - 4 G , ▁were ▁a ▁variant ▁of ▁the ▁A - 4 F ▁Sky h awk . ▁The ▁A - 4 F ▁was ▁the ▁final ▁single - se at ▁version ▁of ▁the ▁Sky h awk ▁to ▁be ▁designed ▁specifically ▁for ▁the ▁U . S . ▁Navy , ▁and ▁first ▁fle w ▁in ▁ 1 9 6 6 ; ▁ 1 6 4 ▁were ▁eventually ▁delivered . ▁This ▁variant ▁had ▁a ▁more ▁powerful ▁engine ▁than ▁that ▁fitted ▁to ▁earlier ▁Sky h aw ks , ▁as ▁well ▁as ▁better ▁protection ▁against ▁ground ▁fire ▁and ▁a ▁distinct ive ▁" h ump " ▁containing ▁av ion ics , ▁which ▁earned ▁it ▁the ▁nick name ▁" Cam el ". ▁The ▁main ▁differences ▁between ▁the ▁F ▁and ▁G ▁variants ▁were ▁that ▁the ▁latter ▁did ▁not ▁have ▁an ▁av ion ics ▁hum p ▁and ▁was ▁fitted ▁to ▁operate ▁A IM - 9 B ▁Side w inder ▁air - to - air ▁miss iles . ▁The ▁A - 4 G s ▁also ▁lack ed ▁the ▁A - 4 F ' s ▁ability ▁to ▁operate ▁gu ided ▁air - to - ground ▁weapons . ▁The ▁two - se at ▁T A - 4 G ▁train ers ▁were ▁fitted ▁with ▁the ▁same ▁av ion ics ▁and ▁weapons ▁as ▁the