1 ▁April ▁ 1 9 4 4 ▁when ▁Second ▁Air ▁Force ▁switched ▁to ▁B - 2 9 ▁Super fort ress ▁training . ▁Late ▁in ▁the ▁war ▁the ▁group ▁was ▁react iv ated ▁and ▁trained ▁as ▁a ▁Very ▁He avy ▁( V H ) ▁B - 2 9 ▁Super fort ress ▁group ▁The ▁group ▁served ▁in ▁the ▁Pacific ▁Ocean ▁the ater ▁of ▁World ▁War ▁II ▁as ▁part ▁of ▁Tw enti eth ▁Air ▁Force . ▁The ▁ 3 3 1 st ▁Bomb ▁Group ' s ▁aircraft ▁engaged ▁in ▁very ▁heavy ▁bomb ard ment ▁B - 2 9 ▁Super fort ress ▁operations ▁against ▁Japan . ▁ ▁History ▁ ▁He avy ▁bom ber ▁replacement ▁training ▁The ▁ 3 3 1 st ▁Bomb ard ment ▁Group ▁was ▁first ▁activ ated ▁in ▁July ▁ 1 9 4 2 ▁at ▁Salt ▁Lake ▁City ▁Army ▁Air ▁Base , ▁Ut ah ▁with ▁the ▁ 4 6 1 st , ▁ 4 6 2 d , ▁ 4 6 3 d ▁and ▁ 4 6 4 th ▁Bomb ard ment ▁Squad rons ▁assigned . ▁ ▁In ▁September ▁it ▁moved ▁to ▁Cas per ▁Army ▁Air ▁Field , ▁where ▁it ▁conducted ▁Bo eing ▁B - 1 7 ▁F lying ▁Fort ress ▁replacement ▁training ▁until ▁ 1 9 4 3 , ▁when ▁it ▁converted ▁to ▁the ▁Cons olid ated ▁B - 2 4 ▁Liber ator . ▁ ▁Rep lacement ▁training ▁units ▁were ▁o vers ized ▁units ▁which ▁trained ▁air cre ws ▁prior ▁to ▁their ▁deployment ▁to ▁combat ▁the aters . ▁However , ▁the ▁Army ▁Air ▁Forces