GHAZNI, Afghanistan—The Pentagon continues to assign bigger and better MRAPs for use in Afghanistan and Iraq, but with every bigger vehicle comes the creation of larger roadside bombs and explosions. Roadside bombs that once weighed 10 to 20 lbs. have now morphed into multigallon-holding drums that when ignited, are capable of blasting 200 to 500 lbs. of explosives. So are the newly built and incredibly expensive Mine Resistant Ambush Vehicles made to withstand and disperse the impact of today’s roadside bombs?