, ▁Rob oth am , ▁George ▁U sh er ▁( Controller ▁of ▁T ank ▁Production ), ▁We eks ▁and ▁Richard son . ▁The ▁greater ▁manufact uring ▁capacity ▁in ▁the ▁USA ▁resulted ▁in ▁US - made ▁t anks ▁providing ▁the ▁bulk ▁of ▁forces , ▁while ▁US ▁design ers , ▁newer ▁to ▁the ▁business ▁of ▁tank ▁design , ▁benef ited ▁from ▁British ▁experience . ▁ ▁The ▁T ank ▁Board ▁stayed ▁in ▁similar ▁configuration ▁for ▁the ▁rest ▁of ▁the ▁war , ▁although ▁individuals ▁filling ▁the ▁roles ▁varied . ▁As ▁ 1 9 4 2 ▁progress ed , ▁Vis count ▁We ir ▁was ▁replaced ▁by ▁Commander ▁Robert ▁M ick lem ▁R N ▁of ▁V ick ers ▁as ▁Chief ▁Executive ▁of ▁T ank ▁Design . ▁Arch ie ▁Bo yd ▁replaced ▁George ▁U sh er ▁as ▁Controller ▁of ▁T ank ▁Production . ▁Claude ▁Gib b ▁was ▁appointed ▁Director - General ▁of ▁Arm oured ▁Fight ing ▁Ve h icles , ▁although ▁Lucas ▁continued ▁to ▁work ▁under ▁him . ▁ ▁In ▁August ▁ 1 9 4 3 , ▁Rob oth am ▁stepped ▁down ▁as ▁C ET D , ▁returning ▁to ▁Roll s - Ro y ce . ▁In ▁ 1 9 4 4 ▁the ▁Director ate ▁of ▁T ank ▁Design ▁returned ▁to ▁design ing ▁its ▁own ▁t anks , ▁creating ▁the ▁Cent ur ion ▁tank ▁ready ▁for ▁delivery ▁in ▁late ▁ 1 9 4 5 . ▁ ▁Cru iser ▁t anks ▁ ▁At ▁the ▁start ▁of ▁the ▁war , ▁the ▁Cru iser ▁M k ▁IV ▁was ▁the ▁current ▁model ▁of ▁Cru