▁Additionally , ▁F RS s ▁are ▁responsible ▁for ▁training ▁aircraft ▁mechan ics , ▁providing ▁replacement ▁aircraft ▁for ▁fleet ▁squad ron ▁attr ition , ▁and ▁standard izing ▁maintenance ▁and ▁aircraft ▁operations . ▁ ▁U . S . ▁Navy ▁and ▁Marine ▁personnel ▁( R P s , ▁instruct ors , ▁maintain ers , ▁etc .) ▁are ▁frequently ▁assigned ▁to ▁other ▁services ' ▁F RS s . ▁The ▁F RS s ▁were ▁formerly ▁known ▁as ▁Rep lacement ▁Air ▁Gr oups , ▁and ▁are ▁thus ▁commonly ▁called ▁" R ags ". ▁ ▁Active ▁ ▁US ▁Navy ▁ ▁US ▁Marine ▁Corps ▁ ▁Dis est ab lished , ▁De activ ated , ▁Re - design ated ▁or ▁otherwise ▁former ▁Fle et ▁Rep lacement ▁Squad rons ▁From ▁ 1 ▁April ▁ 1 9 5 8 ▁to ▁ ▁June ▁ 1 9 7 0 ▁the ▁Navy ▁organized ▁the ▁Fle et ▁Rep lacement ▁Squad rons ▁for ▁car rier ▁based ▁f ighter ▁and ▁attack ▁type ▁aircraft ▁into ▁Read iness ▁Car rier ▁Air ▁Gr oups ▁( RC V G ). ▁On ▁ 2 0 ▁December ▁ 1 9 6 3 ▁when ▁all ▁Car rier ▁Air ▁Gr oups ▁were ▁red es ign ated ▁Car rier ▁Air ▁W ings ▁( CV W ) ▁the ▁R CV G s ▁were ▁red es ign ated ▁Read iness ▁Car rier ▁Air ▁W ings ▁( RC V W ). ▁From ▁ 3 0 ▁June ▁ 1 9 6 0 ▁to ▁February ▁ 1 9 6 1 ▁it ▁organized ▁the ▁Fle et ▁Rep lacement ▁Squad rons ▁for ▁car rier ▁based ▁AS