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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.