International terrorism and insurgencies in areas of conflict have led to the need for enhanced security at national borders and of military and other high-level installations. Border security is a special challenge due to increased travel and movement of goods across the globe. The military bases at Iraq and Afghanistan, while heavily guarded, are not impregnable, especially to attack by car-borne lEDs and shootings through infiltration by Afghan Army officers. At other facilities not within a conflict zone, perimeter security relies on mechanical barriers - fences - and detection - increasingly advanced sensors, imaging and software systems.
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