▁Air ▁Force ▁( US AF ) ▁and ▁Royal ▁Canadian ▁Air ▁Force ▁( RC AF ). ▁Const ruction ▁of ▁a ▁P inet ree ▁Line ▁of ▁Gr ound - Control ▁Inter cept ▁( G CI ) ▁rad ar ▁site ▁ ▁began ▁at ▁Bac car o ▁Point ▁in ▁ 1 9 5 5 ▁and ▁was ▁completed ▁in ▁ 1 9 5 7 . ▁The ▁facility ▁was ▁operated ▁by ▁the ▁US AF ▁as ▁Bar r ington ▁Air ▁Station ▁by ▁the ▁ 6 7 2 d ▁A ircraft ▁Control ▁and ▁Warning ▁Squadron . ▁ ▁Rad ars ▁at ▁the ▁station ▁were : ▁ ▁Search ▁Rad ars : ▁AN / F PS - 3 , ▁AN / F PS - 2 7 , ▁AN / F PS - 5 0 8 ▁ ▁Height ▁Rad ars : AN / F PS - 2 6 , ▁AN / F PS - 6 B , ▁AN / F PS - 6 X ▁ ▁As ▁a ▁G CI ▁base , ▁the ▁ 6 7 2 d ' s ▁role ▁was ▁to ▁guide ▁inter ceptor ▁aircraft ▁toward ▁un ident ified ▁intr ud ers ▁picked ▁up ▁on ▁the ▁unit ' s ▁rad ar ▁scop es . ▁These ▁intercept ors ▁were ▁based ▁at ▁the ▁ 2 6 th ▁N OR AD ▁Region ▁bases ▁at ▁L oring ▁A FB ▁and ▁Dow ▁A FB , ▁Maine . ▁ ▁In ▁the ▁early ▁ 1 9 6 0 s , ▁the ▁US AF ▁rel in qu ished ▁control ▁of ▁the ▁base ▁to ▁the ▁Royal ▁Canadian ▁Air ▁Force ▁( RC AF ).