2 E 1 ▁was ▁selected ▁for ▁production ▁in ▁ 1 9 3 5 ▁as ▁the ▁M 2 , ▁which ▁mounted ▁only ▁the ▁M 2 ▁Brow ning ▁in ▁a ▁small ▁one - man ▁tur ret , ▁and ▁the ▁. 3 0 ▁cal ▁in ▁the ▁h ull . ▁ ▁After ▁only ▁ 1 0 ▁units ▁were ▁delivered , ▁the ▁Infantry ▁Branch ▁decided ▁to ▁switch ▁to ▁a ▁tw in ▁tur ret ▁configuration ▁in ▁the ▁M 2 E 2 , ▁with ▁a ▁. 3 0 - cal iber ▁( 7 . 6 2   mm ) ▁machine ▁gun ▁in ▁a ▁second ▁tur ret . ▁These ▁early ▁tw in - t ur ret ▁t anks ▁were ▁given ▁the ▁nick name ▁" M ae ▁West " ▁by ▁the ▁troops , ▁after ▁the ▁popular ▁b ust y ▁movie ▁star . ▁The ▁tw in - t ur ret ▁layout ▁was ▁in efficient , ▁but ▁was ▁a ▁common ▁feature ▁of ▁ 1 9 3 0 s ▁light ▁t anks ▁derived ▁from ▁the ▁V ick ers , ▁such ▁as ▁the ▁Soviet ▁T - 2 6 ▁and ▁Polish ▁ 7 TP . ▁Further ▁ref in ements ▁to ▁the ▁M 2 A 2 ▁produced ▁the ▁A 3 ▁model , ▁which ▁incorpor ated ▁a ▁modified ▁susp ension ▁system ▁that ▁reduced ▁the ▁tank ' s ▁ground ▁pressure . ▁The ▁weight ▁increased ▁to ▁ 1 0 ▁tons . ▁ ▁Following ▁the ▁Spanish ▁Civil ▁War , ▁most ▁arm ies , ▁including ▁the ▁U . S . ▁Army , ▁realized ▁that ▁they ▁needed ▁t anks ▁armed ▁with ▁can non ▁and