▁is ▁one ▁of ▁the ▁earliest ▁used ▁by ▁the ▁U . S . ▁Navy . ▁A ▁" T or ped o ▁Pl ane ▁Squadron " ▁existed ▁as ▁early ▁as ▁ 1 9 2 0 ▁but ▁the ▁use ▁of ▁abbre vi ated ▁squad ron ▁design ations ▁( such ▁as ▁" V T ") ▁did ▁not ▁come ▁into ▁accepted ▁use ▁until ▁ 1 9 2 2 . ▁From ▁ 1 9 2 2 ▁to ▁ 1 9 3 0 ▁it ▁designated ▁" T or ped o ▁& ▁Bomb ing ▁Pl ane ▁Squad rons " ▁or ▁" T or ped o ▁and ▁Bomb ing ▁Squad rons ". ▁ ▁In ▁ 1 9 3 0 ▁it ▁designated ▁" T or ped o ▁Squad rons " ▁until ▁ 1 9 4 6 ▁when ▁all ▁remaining ▁V T ▁squad rons ▁were ▁red es ign ated ▁Att ack ▁( VA ) ▁squad rons ▁and ▁the ▁V T ▁design ation ▁disappeared . ▁Between ▁ 1 9 2 7 ▁and ▁ 1 9 3 7 ▁a ▁suffix ▁letter ▁was ▁added ▁after ▁the ▁design ation ▁number ▁to ▁identify ▁to ▁which ▁fleet ▁or ▁Naval ▁District ▁the ▁squad ron ▁belonged : ▁B ▁for ▁Battle ▁Fle et , ▁S ▁for ▁Sc out ing ▁Fle et , ▁A ▁for ▁A si atic ▁Fle et ▁or ▁D ▁followed ▁by ▁a ▁Naval ▁District ▁number ▁for ▁those ▁squad rons ▁assigned ▁to ▁Naval ▁District s . ▁ ▁On ▁ 1 5 ▁November ▁ 1 9 4 6 ▁the ▁squad ron ▁design ation ▁system ▁under w ent ▁a ▁major ▁change ; ▁the ▁