How many other buildings have bullet-proof windows?
There is no such thing as bullet-proof glass. Industry experts all stress that it is not possible to make windows that provide complete protection from gunfire.
"Only our name is bullet-proof," says Ken Sampson, owner and founder of United States Bullet Proofing Inc.
"The term we prefer is bullet-resistant. They can always come back with a bigger gun."
Demand for Mr Sampson's products has "quadrupled" over the past two years, he says, as the US economy has turned sour.
Read more: www.bbc.co.uk/news/magazine-15762682