In an unassuming town outside Detroit, a small American startup is quietly preparing U.S. troops for the next era of warfare — where battles won’t be fought by soldiers, but by swarms of machines.Swarm Defense originally built its business around large-scale drone light shows but has since pivoted into military applications. Today, the same coordination and precision once used for entertainment are being applied to help replicate one of the most complex threats facing modern soldiers: coordinated drone-swarm attacks.FOX Business’ Kelly Saberi told "Varney & Co." that Swarm Defense’s techno...

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