The Differential Theory of Terrorism Alert Levels (Foreign Model)
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Perimeter Protection

Perimeter hires_100124-F-2703B-011a

As seen through a night-vision device, U.S. Army Staff Sgt. Chad Melanson performs a night patrol of the perimeter of Camp Wright in Asadabad, Afghanistan, Jan. 24, 2010. Melanson is a Kunar Provincial Reconstruction Team and security forces member assigned to the Nevada National Guard’s 1st Squadron, 221st Calvary Regiment.
U.S. Air Force photo by Tech. Sgt. Brian Boisvert