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influx
on Dec 29, 2014
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Blimps Protecting Washington, D.C
These blimps have been used for well over a decade in the southern US border to detect low flying drug smuggling aircraft.
vibrolax
on Dec 29, 2014
[–]
For example, the aerostat that's been tethered at cudjoe key since about 1980.
http://en.m.wikipedia.org/wiki/Tethered_Aerostat_Radar_Syste...
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