▁New ▁Mexico ▁in ▁ 1 9 1 6 , ▁the ▁ 1 st ▁Arizona ▁Infantry ▁was ▁activ ated ▁and ▁head qu arter ed ▁at ▁Camp ▁N aco , ▁Arizona ▁and ▁assigned ▁border ▁protection ▁duties . ▁ ▁The ▁regiment ▁was ▁draft ed ▁into ▁Federal ▁Service ▁for ▁World ▁War ▁I , ▁ 5 ▁August ▁ 1 9 1 7 ▁as ▁part ▁of ▁the ▁ 4 0 th ▁Infantry ▁Division . ▁Re organ ization ▁after ▁the ▁ 1 st ▁World ▁War ▁assigned ▁the ▁ 1 5 8 th ▁Infantry ▁to ▁the ▁ 4 5 th ▁Infantry ▁Division . ▁On ▁ 1 6 ▁September ▁ 1 9 4 0 , ▁the ▁declaration ▁of ▁the ▁National ▁Emer gency , ▁the ▁ 1 5 8 th ▁Infantry ▁joined ▁its ▁parent ▁organization , ▁the ▁ 4 5 th ▁Division ▁at ▁Fort ▁S ill , ▁Oklahoma . ▁After ▁being ▁rel ieved ▁by ▁divisions ▁in ▁campaign ▁after ▁campaign ▁across ▁the ▁Pacific , ▁the ▁ 1 5 8 th ▁Infantry ▁was ▁selected ▁to ▁spe ar head ▁the ▁final ▁invasion ▁of ▁Japan . ▁ ▁Units ▁from ▁Arizona ▁were ▁called ▁into ▁action ▁on ▁September ▁ 2 6 , ▁ 1 9 4 0 . ▁The ▁ 1 5 8 th ▁Regiment al ▁Com bat ▁Team ▁were ▁given ▁the ▁name ▁the ▁" B ush master s ," ▁named ▁after ▁the ▁dead ly ▁Bush master ▁s nake ▁in ▁Pan ama . ▁General ▁Douglas ▁Mac Ar thur ▁said , ▁" No ▁greater ▁fighting ▁combat ▁team ▁has ▁ever ▁deployed ▁for ▁battle ." ▁ ▁The ▁ 1 5 8 th