▁through ▁large , ▁circular ▁roof ▁h atch ▁in ▁h ull ▁rear . ▁Before ▁the ▁US ▁Army ▁changed ▁their ▁design ation ▁system , ▁the ▁X M 1 0 6 ▁was ▁known ▁as ▁the ▁T 2 5 7 E 1 . ▁ ▁M 1 0 6 A 1 : ▁M 1 0 6 ▁with ▁dies el ▁engine . ▁ ▁M 1 0 6 A 2 : ▁M 1 0 6 A 1 ▁with ▁M 1 1 3 A 2 ▁improvements . ▁ ▁M 1 1 3 ▁A ME V : ▁Arm ored ▁Medical ▁Ev acu ation ▁Ve h icle . ▁A ▁specifically ▁modified ▁and ▁equ ipped ▁M 1 1 3 ▁for ▁use ▁as ▁an ▁arm ored ▁amb ul ance . ▁ ▁M 1 1 3 ▁OS V : ▁OP FOR ▁Sur rog ate ▁Ve h icle ▁( OS V ) ▁used ▁to ▁simulate ▁enemy ▁track ed ▁vehicles ▁in ▁force - on - force ▁training . ▁ ▁M 1 2 5 : ▁Mort ar ▁car rier ▁similar ▁to ▁M 1 0 6 , ▁but ▁with ▁ 8 1   mm ▁M 2 9 ▁mort ar . ▁ ▁M 1 3 2 ▁Arm ored ▁Fl am eth ro wer : ▁A ▁full - track ed ▁self - prop elled ▁fl ame ▁thro wer ▁car rier , ▁with ▁small ▁tur ret ▁carrying ▁an ▁M 1 0 - 8 ▁fl am eth ro wer ▁and ▁co ax ial ▁M 7 3 ▁machine ▁gun , ▁plus ▁fuel ▁and ▁pressure ▁t anks ▁in ▁rear ▁of ▁h ull . ▁ ▁M 1