The Transportation Security Administration's Four Major Security Programs for Mass Transit [video]
Center for Homeland Defense and Security Naval Postgraduate School
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The nation's transit agencies in urban areas have been classified as either Tier I or II. Tier I includes the nation's 8 largest urban areas, with all other urban areas classified as Tier II. Since 9/11 a bulk of the federal government's attention and funding has been directed towards Tier I regions. In his thesis, John Joyce argues that, in light of recent foiled plots against Tier II areas, the changing threat environment requires more protection for areas designated as Tier II.