▁Drag ons " ▁▁ 2 nd ▁Battalion ▁( General ▁Support ), ▁ 5 0 1 st ▁A viation ▁Regiment ▁( 2 nd ▁General ▁Support ▁Battalion ▁ 5 0 1 st ▁A viation ▁Regiment ) ▁" Des ert ▁Kn ights " ▁▁ 3 rd ▁Battalion ▁( Ass ault ), ▁ 5 0 1 st ▁A viation ▁Regiment ▁( 3 rd ▁Ass ault ▁Battalion ▁ 5 0 1 st ▁A viation ▁Regiment ) ▁ ▁" Ap ocal yp se " ▁▁ 1 2 7 th ▁A viation ▁Support ▁Battalion ▁( A SB ) ▁" Work ▁Hor se " ▁▁ 1 st ▁Arm ored ▁Division ▁S ust ain ment ▁Brigade ▁( D SB ) ▁" M ules k inner " ▁ ▁H HC ▁ ▁Special ▁Tro ops ▁Battalion ▁( ST B ) ▁" I ron ▁Leg ion " ▁▁ 1 4 2 nd ▁Com bat ▁S ust ain ment ▁Support ▁Battalion ▁( CS SB ) ▁" Atlas " ▁ ▁In sign ia ▁ ▁The ▁division ▁was ▁nick named ▁" Old ▁Ir ons ides " ▁by ▁its ▁first ▁commander , ▁Major ▁General ▁Bruce ▁R . ▁Mag r uder , ▁after ▁he ▁saw ▁a ▁picture ▁of ▁the ▁fr ig ate ▁USS ▁Constitution , ▁also ▁nick named ▁" Old ▁Ir ons ides ". ▁The ▁large ▁" 1 " ▁at ▁the ▁top ▁represents ▁the ▁numerical ▁design ation ▁of ▁the ▁division ▁and ▁the ▁ins ign ia ▁is ▁used ▁as ▁a ▁basis ▁for ▁most ▁of ▁the ▁other ▁sub - unit ▁ins ign ias . ▁ ▁In ▁January ▁ 1 9 1 8