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from the popular mechanic link
Every inch of the limo's metal skin is backed by military-grade armor, which offers the highest level of protection with the least weight and bulk penalty. The car's windows�which do not open�are actually transparent armor. All the car's armor is at least 5 in. thick, giving the president maximum protection in the event of any attack. The interior is also environmentally sealed to protect the occupants from chemical and airborne germ-warfare terrorism.
Originally posted by DarkHelmet
If they're talking about Bill I'm sure it's pretty easy.