5 , ▁replacing ▁the ▁Av ro ▁Lanc aster ▁mar itime ▁aircraft . ▁The ▁Canadian ▁P 2 V 7 ▁was ▁fitted ▁with ▁p ist on ▁engines ▁initially , ▁though , ▁in ▁ 1 9 5 9 , ▁the ▁Ne pt unes ▁had ▁two ▁under wing ▁West ing house ▁J 3 4 ▁jet ▁engine ▁pod s ▁retro f itted , ▁similar ▁to ▁those ▁fitted ▁to ▁US ▁Navy ▁variants . ▁Arm ament ▁included ▁two ▁tor ped o es , ▁mines , ▁depth ▁charges , ▁bomb s ▁carried ▁internally ▁plus ▁un gu ided ▁rock ets ▁mounted ▁extern ally ▁under wing . ▁A ▁total ▁of ▁ 2 5 ▁Ne pt unes ▁served ▁with ▁nos . ▁ 4 0 4 , ▁ 4 0 5 ▁and ▁ 4 0 7 ▁squad rons ▁until ▁ 1 9 6 0 . ▁Upon ▁un ification ▁of ▁the ▁Canadian ▁Forces ▁in ▁ 1 9 6 8 , ▁the ▁Ne pt une ▁was ▁retired ▁and ▁retro act ively ▁re - design ated ▁the ▁CP 1 2 2 , ▁The ▁RC AF ▁Ne pt une ▁was ▁replaced ▁by ▁the ▁Canada ir ▁CP - 1 0 7 ▁Arg us ▁in ▁the ▁same ▁year . ▁ ▁With ▁the ▁found ing ▁of ▁NAT O ▁in ▁ 1 9 4 9 ▁and ▁the ▁resulting ▁additional ▁mar itime ▁commit ments ▁it ▁ent a iled ▁for ▁Britain , ▁The ▁Royal ▁Air ▁Force ▁Coast al ▁Command ▁operated ▁ 5 2 ▁P 2 V - 5 s , ▁designated ▁Ne pt une ▁MR . 1 s ▁as ▁a ▁stop - g ap ▁modern