▁million ▁men . ▁B ingham ▁spent ▁the ▁years ▁after ▁the ▁First ▁World ▁War ▁writing ▁books ▁and ▁articles ▁emphas izing ▁the ▁civil ian ▁applications ▁of ▁the ▁testing ▁procedures ▁he ▁helped ▁develop ▁for ▁the ▁Army . ▁He ▁believed ▁that ▁apt itude ▁tests ▁and ▁intelligence ▁sub test ▁scores ▁could ▁be ▁used ▁to ▁help ▁business es ▁increase ▁the ▁efficiency ▁of ▁their ▁work force . ▁Further , ▁it ▁would ▁help ▁teachers ▁and ▁coun sel ors ▁direct ▁their ▁students ▁and ▁clients ▁to ▁care ers ▁that ▁would ▁make ▁them ▁happy . ▁B ingham ▁also ▁noted ▁that ▁apt itude ▁testing ▁would ▁be ▁useful ▁for ▁ident ifying ▁the ▁types ▁of ▁jobs ▁at ▁which ▁the ▁development ally ▁disabled ▁could ▁be ▁successful . ▁ ▁The ▁on s la ug ht ▁of ▁World ▁War ▁II ▁brought ▁a ▁new ▁position ▁as ▁Chief ▁psych ologist ▁in ▁the ▁Army ▁Ad j ut ant ▁General ' s ▁office ▁to ▁B ingham . ▁In ▁ 1 9 4 0 , ▁he ▁was ▁appointed ▁Chair man ▁of ▁the ▁Army ▁National ▁Research ▁Council ▁on ▁Classification ▁of ▁Military ▁Person nel . ▁His ▁research ▁team ▁created ▁a ▁series ▁of ▁apt itude ▁tests ▁that ▁served ▁several ▁purposes . ▁B ingham ▁believed ▁that ▁these ▁apt itude ▁tests ▁would ▁help ▁the ▁war ▁effort ▁through ▁increasing ▁American ▁military ▁might . ▁He ▁assert ed ▁that ▁the ▁human ▁engineering ▁made ▁possible ▁by ▁the ▁administration ▁of ▁apt itude ▁tests ▁would ▁increase ▁the ▁efficiency ▁and ▁effect iveness ▁of ▁military ▁training ▁programs ▁in ▁the ▁same ▁way ▁that ▁mechanical ▁engineering ▁maxim izes ▁the ▁effect iveness ▁of ▁t anks , ▁guns , ▁and ▁air plan