From YouTube:
4-16-2012 – Military conducts Urban Warfare Training over the skies of Downtown Chicago with Blackhawks A/MH-6 Little Bird helicopters and Heavily Armed Special forces. Residents reported seeing these teams for hours as they made their way through downtown Chicago’s skyscrapers. More info @ http://offgridsurvival.com/urbanwarfaredrillsdowntownchicago/
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