▁the ▁mass ▁production ▁aircraft ▁models ▁to ▁the ▁needs ▁of ▁the ▁specific ▁the aters ▁of ▁operations ". ▁ ▁Bell ▁was ▁contract ed ▁to ▁operate ▁the ▁center , ▁and ▁the ▁air field ▁le ased ▁by ▁the ▁USA AF ▁was ▁improved ▁with ▁mac ad am ▁run ways ▁( three ▁at ▁ 4 0 0 0 x 1 5 0 ▁feet ▁and ▁the ▁E / W ▁run way ▁at ▁ 4 2 0 0 x 3 0 0 ), ▁tax i ways , ▁etc . ▁Military ▁units ▁at ▁Ni ag ara ▁F alls ▁included ▁a ▁Mod ification ▁Center ▁Head quarters ▁and ▁a ▁training ▁school , ▁" N i ag ara ▁F alls ▁East ▁Tr ▁Sch " ▁( a ▁different ▁modification ▁center , ▁" B uff alo ▁Mun - Mod ▁C tr ▁B ", ▁was ▁located ▁at ▁the ▁ 1 9 2 5 ▁Buff alo ▁Municipal ▁Airport ). ▁▁ ▁In ▁ 1 9 4 4 , ▁the ▁Manh attan ▁Engine er ▁District ▁used ▁the ▁military ▁Ni ag ara ▁F alls ▁Storage ▁Site ▁on ▁the ▁ 1 9 4 1 ▁Lake ▁Ontario ▁Or dn ance ▁Works ▁Site ▁for ▁radio active ▁resid ues ▁and ▁was tes ▁from ▁u ran ium ▁ore ▁processing . ▁ ▁Naval ▁air ▁station ▁The ▁Naval ▁Air ▁Station ▁Ni ag ara ▁F alls ▁was ▁established ▁in ▁ 1 9 4 6 ▁and ▁the ▁installation ▁was ▁expanded . ▁ ▁Jur is diction ▁of ▁the ▁air port ▁returned ▁to ▁a ▁civil ian ▁ag ency ▁later ▁in ▁ 1 9 4 6 ▁( a ▁US AF ▁joint - use ▁agreement