Blimps to bolster Washington's air shield in test

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A Raytheon Joint Land Attack Cruise Missile Defense Elevated Netted Sensor System (JLENS) aerostat is pictured at the White Sands Missile Range, New Mexico, in this February 24, 2012 photo obtained on February 1, 2013. A pair of the bulbous, helium-filled ''aerostats'' - each more than three quarters the length of a football field at 243 feet (74 meters) are to be added to a high-tech shield designed to protect the Washington DC area from air attack. Picture taken February 24, 2012. REUTERS/John Hamilton/DVIDS/Handout