United States federal building security
Encyclopedia
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
Glazing
Glazing, which derives from the Middle English for 'glass', is a part of a wall or window, made of glass. Glazing also describes the work done by a professional "glazier"...

 to reduce the potential for injuries from shattering glass; greater standoff distance
Standoff distance
Standoff distance is a security measure that focused on preventing unscreened vehicles from approaching within a certain distance of a building. It is intended to deter truck bombs by making it more difficult for them to cause catastrophic damage. In the wake of the Oklahoma City bombing, many...

s implemented by preventing unscreened traffic from approaching within a certain distance of the building; and measures to prevent progressive collapse
Progressive collapse
A building undergoes progressive collapse when a primary structural element fails, resulting in the failure of adjoining structural elements, which in turn causes further structural failure, similar to a house of cards....

 of buildings.

Security levels

In the wake of the Oklahoma City bombing
Oklahoma City bombing
The Oklahoma City bombing was a terrorist bomb attack on the Alfred P. Murrah Federal Building in downtown Oklahoma City on April 19, 1995. It was the most destructive act of terrorism on American soil until the September 11, 2001 attacks. The Oklahoma blast claimed 168 lives, including 19...

 in 1995, the government classified all buildings into five security levels and established minimum security requirements for them.

Level V

These buildings contain mission functions critical to national security, such as the Pentagon
The Pentagon
The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia. As a symbol of the U.S. military, "the Pentagon" is often used metonymically to refer to the Department of Defense rather than the building itself.Designed by the American architect...

 or CIA Headquarters. A Level-V building should be similar to a Level-IV building in terms of number of employees and square footage. It should have at least the security features of a Level-IV building. The missions of Level-V buildings require that tenant agencies secure the site according to their own requirements.

Level IV

This type of building has 451 or more federal employees; high volume of public contact; more than 150000 square feet (13,935.5 m²) of space; and tenant agencies that may include high-risk law enforcement and intelligence agencies (e.g., ATF
Bureau of Alcohol, Tobacco, Firearms and Explosives
The Bureau of Alcohol, Tobacco, Firearms and Explosives is a federal law enforcement organization within the United States Department of Justice...

, FBI, and DEA
DEA
DEA is the commonly used acronym for the Drug Enforcement Administration, a United States law enforcement agency.DEA or Dea may also refer to:- Organizations :* DEA , UK development education charity...

), the Federal courts, and judicial offices, and highly sensitive government records.

Level III

This is a building with 151 to 450 federal employees; moderate/high volume of public contact; 80,000 to 150000 square feet (13,935.5 m²) of space; and tenant agencies that may include law enforcement agencies, court/related agencies and functions, and government records and archives. (According to GSA, at the request of the Judiciary, GSA changed the designation of a number of buildings housing agencies with court and court-related functions from Level III to Level IV.)

Level II

This type of building has 11 to 150 federal employees; moderate volume of public contact; 2,500 to 80000 square feet (7,432.2 m²) of space; and federal activities that are routine in nature, similar to commercial activities.

Level I

This type of building has 10 or fewer federal employees; low volume of public contact or contact with only a small segment of the population; and 2,500 or less square feet of space, such as a small "store front" type of operation. This type of building is more vulnerable to attack.
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