Also the design specification was to survive and remain operations after being hit by a 30 PSI shock wave. It appears that the vehicles were capable of meeting this requirement.
http://www.cdc.gov/niosh/docket/arch...geChambers.pdf
30 PSI is enough to destroy reinforced concrete structures. To survive this blast overpressure the vehicle will also need to be able to survive being struck by large high velocity fragments and debris. I wonder ballistic energy the vehicle could survive would be. I doubt it would be the Science Rover's 1100 but I would hazard a guess it will stop most if not all 7.62mm rounds.