TM 10-8415-209-10 TM 8415-10/2 f. Overshoes, Men's and Women's, Boot, Combat (GVOs, BVO.s). CAUTION Prolonged   contact   with   Decontamination   Solution   No.   2   (DS2)   will degrade the GVO/BVO. The GVOs (green) and BVOs {black) are impermeable vinyl overshoes with elastic fasteners.  The GVO/BVO worn over  the  standard  leather  combat  boot  protects  the  wearer  against  CB  agents,  radioactive  materials,  rain,  mud  or snow.    (However,  GVOs  and  BVOs  issued  and  worn  for  environmental  protection  should  not  be  used  for  NBC protection.    A  new  pair  should  be  issued  with  NBC  protective  gear  .)  Refer  to  FM  3-4/FMFM  11-9  for  protective capabilities. 1-19