▁early ▁stages ▁of ▁defining ▁requirements ▁for ▁the ▁C - X ▁next ▁generation ▁air l if ter ▁program ▁to ▁replace ▁both ▁the ▁C - 1 3 0 ▁and ▁C - 1 7 . ▁An ▁aircraft ▁would ▁be ▁produced ▁from ▁the ▁early ▁ 2 0 3 0 s ▁to ▁the ▁ 2 0 4 0 s . ▁If ▁requirements ▁are ▁decided ▁for ▁operating ▁in ▁cont ested ▁air space , ▁Air ▁Force ▁proc ure ment ▁of ▁C - 1 3 0 s ▁would ▁end ▁by ▁the ▁end ▁of ▁the ▁de cade ▁to ▁not ▁have ▁them ▁service able ▁by ▁the ▁ 2 0 3 0 s ▁and ▁operated ▁when ▁they ▁cannot ▁perform ▁in ▁that ▁environment . ▁Development ▁of ▁the ▁air l if ter ▁depends ▁heavily ▁on ▁the ▁Army ' s ▁" t act ical ▁and ▁oper ational ▁man eu ver " ▁plans . ▁Two ▁different ▁cargo ▁plan es ▁could ▁still ▁be ▁created ▁to ▁separately ▁perform ▁tact ical ▁and ▁strateg ic ▁miss ions , ▁but ▁which ▁course ▁to ▁purs ue ▁is ▁to ▁be ▁decided ▁before ▁C - 1 7 s ▁need ▁to ▁be ▁retired . ▁Brazil ▁is ▁replacing ▁its ▁C - 1 3 0 s ▁with ▁ 2 8 ▁new ▁Em bra er ▁K C - 3 9 0 s . ▁Portugal ▁is ▁doing ▁the ▁same . ▁ ▁Oper ational ▁history ▁ ▁Military ▁ ▁The ▁first ▁batch ▁of ▁C - 1 3 0 A ▁production ▁aircraft ▁were ▁delivered ▁beginning ▁in ▁ 1 9 5 6 ▁to ▁the ▁ 4 6 3 d ▁Tro op ▁Car rier ▁Wing ▁at