The OPFOR Marid APC lacks the option for either the driver or gunner to turn out of the vehicle. Hatches do appear to be modelled on the vehicle and the BLUFOR APC has this option so it seems to have been an oversight?
Footage of the hatches of the ARMA being open: http://www.youtube.com/watch?feature=player_detailpage&v=UZ-U_BzifxM#t=53s {F20300}