The Federal Aviation Administration has given the green light for the U.S. military to deploy high-energy counter-drone laser weapons in U.S. airspace, adding a new, low-cost layer of protection against the rising threat from kamikaze drones. The decision follows a two-month interagency standoff over whether the systems posed a risk to general aviation and commercial aircraft, as well as incidents in Texas earlier this year that briefly led to an airspace closure.