red ▁to ▁by ▁its ▁operators ▁as ▁the ▁" s lick - 3 2 ". ▁The ▁SL Q - 3 2 ▁was ▁originally ▁conce ived ▁in ▁the ▁ 1 9 7 0 s ▁to ▁augment ▁the ▁AN / W LR - 1 , ▁which ▁had ▁been ▁in ▁service ▁since ▁the ▁early ▁ 1 9 6 0 s . ▁It ▁was ▁later ▁determined ▁to ▁save ▁costs ▁to ▁replace ▁the ▁various ▁W LR - 1 ▁series ▁su ites ▁with ▁the ▁SL Q - 3 2 ▁as ▁a ▁stand - alone ▁system . ▁As ▁originally ▁designed , ▁the ▁SL Q - 3 2 ▁was ▁produced ▁in ▁three ▁variants , ▁the ▁( V ) 1 , ▁( V ) 2 ▁and ▁( V ) 3 . ▁ ▁Later ▁in ▁its ▁service ▁life , ▁two ▁additional ▁versions ▁were ▁built , ▁the ▁( V ) 4 ▁and ▁( V ) 5 . ▁ ▁The ▁Air ▁Transport ▁R ack ▁s ized ▁process ors ▁were ▁supplied ▁by ▁R OL M ▁Mil - Spec ▁Comput ers ▁in ▁San ▁Jose , ▁CA . ▁ ▁SL Q - 3 2 ( V ) 1 ▁– ▁A ▁simple ▁threat ▁warning ▁receiver , ▁it ▁was ▁capable ▁of ▁receiving ▁high - band ▁rad ar ▁signals ▁of ▁the ▁type ▁commonly ▁carried ▁on ▁miss iles ▁and ▁aircraft . ▁ ▁The ▁( V ) 1 ▁was ▁installed ▁on ▁auxili ary ▁ships ▁and ▁small ▁combat ants ▁such ▁as ▁fr ig ates . ▁ ▁This ▁variant ▁of ▁the ▁system ▁is ▁being ▁ph ased ▁out ▁as ▁current ▁ships ▁equ ipped ▁become ▁de comm ission