▁is ▁still ▁possible ▁to ▁find ▁rem n ants ▁of ▁these ▁w art ime ▁air fields . ▁Many ▁were ▁converted ▁into ▁municipal ▁air ports , ▁some ▁were ▁returned ▁to ▁agricult ure ▁and ▁several ▁were ▁retained ▁as ▁United ▁States ▁Air ▁Force ▁install ations ▁and ▁were ▁front - line ▁bases ▁during ▁the ▁Cold ▁War . ▁H undred s ▁of ▁the ▁temporary ▁buildings ▁that ▁were ▁used ▁surv ive ▁today , ▁and ▁are ▁being ▁used ▁for ▁other ▁purposes . ▁ ▁Major ▁Air fields ▁Second ▁Air ▁Force ▁and ▁Air ▁Techn ical ▁Service ▁Command ▁ ▁Cas per ▁Army ▁Air ▁Field , ▁Cas per , ▁Wy oming ▁▁ 3 3 1 st ▁Bomb ard ment ▁Group ▁( He avy ), ▁ 1 5 ▁September ▁ 1 9 4 2 - 1 ▁April ▁ 1 9 4 4 ▁▁ 3 5 1 st ▁Base ▁Head quarters ▁and ▁Air ▁Base ▁Squadron ▁( Second ▁AF ), ▁ 1 5 ▁September ▁ 1 9 4 2 - 1 ▁April ▁ 1 9 4 4 ▁▁ 2 1 1 th ▁Army ▁Air ▁Force ▁Base ▁Unit ▁( Second ▁AF ), ▁ 1 ▁April ▁ 1 9 4 4 - 7 ▁March ▁ 1 9 4 5 ▁▁ 4 1 8 8 th ▁Army ▁Air ▁Force ▁Base ▁Unit ▁( AT SC ), ▁ 7 ▁March ▁ 1 9 4 5 - 1 ▁October ▁ 1 9 4 6 ▁ ▁Now : ▁Nat ron a ▁County ▁International ▁Airport ▁▁ ▁Che y enne ▁Municipal ▁Airport , ▁Che y enne , ▁Wy oming ▁ ▁J oint ▁Use ▁USA AF / C