Photo of the Day: Eye in the Sky
When the US Armed Forces needs an invisible eye in the sky to monitor and assess threats post 9/11, they turned to the RQ-4 Global Hawk. This drone produced by Northrup Grumman would allow operators to get similar surveillance as provided by the U-2 but without placing a pilot in hostile territory. The RQ-4 is capable of surveying over 40,000 square miles a day. (Photo: December 22, 2014)

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