Air defense exercise over D.C.
People in the Washington, D.C., region shouldn't be alarmed if they hear the sound of fighter jets and helicopters overnight.
The U.S. military is planning overnight training flights to test the region's aerospace defenses.
The North American Aerospace Defense Command says the flights will take place early Wednesday morning between midnight and 2 a.m.
Civil Air Patrol aircraft, Air Force F-16 fighters and a Coast Guard helicopter are expected to participate.
The command has conducted similar exercises throughout the U.S. and Canada since the terrorist attacks on Sept. 11, 2001.
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