▁for ▁delivery ▁to ▁Str ateg ic ▁Air ▁Command ▁bare ly ▁eight ▁months ▁after ▁its ▁first ▁flight . ▁▁ 6 5 1 0 ▁Test ▁Squadron ▁When ▁the ▁aircraft ▁reached ▁oper ational ▁squad rons , ▁many ▁short com ings ▁were ▁discovered . ▁ ▁Air ▁Force ▁Systems ▁Command ▁formed ▁the ▁ 6 5 1 0 th ▁Test ▁Squadron ▁in ▁March ▁ 1 9 8 9 ▁to ▁test ▁these ▁modifications . ▁Mod ifications ▁included ▁those ▁needed ▁to ▁improve ▁the ▁low - alt itude ▁range ▁of ▁the ▁aircraft , ▁which ▁it ▁was ▁well ▁short ▁of ▁its ▁proposed ▁maximum ▁un ref ue led ▁range ▁of ▁ 7 , 4 5 5 ▁miles . ▁ ▁The ▁modifications ▁increased ▁the ▁range ▁of ▁the ▁aircraft ▁from ▁ 1 , 3 0 0 ▁na ut ical ▁miles ▁to ▁over ▁ 3 , 0 0 0 . ▁▁ ▁Other ▁modifications ▁tested ▁were ▁to ▁correct ▁problems ▁with ▁the ▁terrain - follow ing ▁rad ar ▁system , ▁def ensive ▁av ion ics ▁systems , ▁fuel ▁le aks ▁and ▁the ▁Lan cer ' s ▁central ▁integrated ▁test ▁system . ▁ ▁In ▁December ▁ 1 9 9 0 ▁General ▁Electric ▁F 1 0 1 ▁engine ▁tur bo fan ▁bla de ▁fail ures ▁caused ▁the ▁ground ing ▁of ▁the ▁B - 1 B ▁aircraft , ▁requiring ▁additional ▁modifications . ▁ ▁The ▁B - 1 ▁test ▁mission ▁transferred ▁to ▁ 6 5 1 9 th ▁Test ▁Squadron ▁on ▁ 1 ▁July ▁ 1 9 9 1 ▁and ▁the ▁squad ron ▁ceased ▁operations , ▁however ▁it ▁remained ▁active . ▁ ▁F