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United States federal building security
United States federal building security refers to the security of federal government installations in the United States. A variety of measures are undertaken to make the buildings safer, while preserving an "open" architecture consistent with democratic governance. This includes glass glazing to reduce the potential for injuries from shattering glass; greater standoff distances implemented by preventing unscreened traffic from approaching within a certain distance of the building; and measures to prevent progressive collapse of buildings.
==Security levels==
In the wake of the Oklahoma City bombing in 1995, the government classified all buildings into five security levels and established minimum security requirements for them.〔http://www.protectiveglazing.org/resources/Anti-Terrorism%20-%20Criteria,%20Tools%20and%20Technology.pdf〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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