REFILE-Blimps to bolster Washington's air shield in test
February 01, 2013 at 16:08 PM EST
WASHINGTON, Feb 1 (Reuters) - A pair of big, blimp-like craft, moored to the ground and flying as high as 10,000 feet (3,000 metres), are to be added to a high-tech shield designed to protect the Washington D.C. area from air attack, at least for a while.
