The global proliferation of unmanned aerial systems and the technologies to counter them has the Pentagon's technology chief predicting continued "explosive growth." Under Secretary of Defense for Research and Engineering Heidi Shyu, who spoke at the National Defense Industrial Association’s emerging technology conference today, also pointed to the increasingly widespread availability of commercial UAS products. “Because you have so many components you can just buy off the shelf, and you’re seeing results,” she said. Much of what the Pentagon is...