ived ▁T - 4 3 . ▁ ▁In ▁ 1 9 7 5 , ▁the ▁Navy ▁retired ▁all ▁of ▁its ▁T - 2 9 s ▁assigned ▁to ▁Training ▁Squadron ▁Tw enty - N ine ▁( V T - 2 9 ) ▁at ▁NAS ▁Cor pus ▁Christ i , ▁Texas , ▁de activ ated ▁V T - 2 9 , ▁and ▁merged ▁their ▁advanced ▁navig ator ▁training ▁program ▁for ▁land - based ▁N FO s ▁with ▁the ▁Air ▁Force ' s ▁program ▁at ▁M ather ▁A FB . ▁ ▁A ▁planned ▁bom ber ▁training ▁version ▁of ▁the ▁T - 2 9 ▁( design ated ▁T - 3 2 ) ▁was ▁never ▁built . ▁The ▁CV - 3 4 0 ▁model ▁was ▁used ▁for ▁most ▁C - 1 3 1 D s . ▁ ▁In ▁addition ▁to ▁T - 2 9 ▁variants , ▁the ▁United ▁States ▁Navy ▁used ▁the ▁Sam ar itan , ▁initially ▁designated ▁as ▁the ▁R 4 Y ▁until ▁ 1 9 6 2 , ▁at ▁which ▁point ▁the ▁naval ▁aircraft ▁were ▁also ▁red es ign ated ▁as ▁C - 1 3 1 s . ▁ ▁Near ly ▁all ▁of ▁the ▁C - 1 3 1 s ▁left ▁the ▁active ▁US AF ▁invent ory ▁in ▁the ▁late ▁ 1 9 7 0 s , ▁but ▁the ▁U . S . ▁Coast ▁Guard ▁operated ▁the ▁aircraft ▁until ▁ 1 9 8 3 , ▁while ▁the ▁Air ▁National ▁Guard ▁and ▁U . S . ▁Navy ▁units ▁operated ▁additional ▁C - 1 3 1 ▁air frames