The U.S. military has tested, multiple times, a brain implant that allows a human operator to simultaneously control, with their thoughts, up to three flying drones.

Well, in theory. The tests, overseen by the Defense Advanced Research Projects Agency (DARPA), were computer simulations. And while they might eventually lead to actual mind control for flying robots, the technology is still in its infancy.

The mind-controlled drone trials took place in Pittsburgh between June 2016 and January 2017, according to DARPA. “Using a bidirectional neural interface, a volunteer named Nathan Copeland was able to simultaneously steer a simulated lead aircraft and maintain formation of two, simulated unmanned support aircraft in a flight simulator,” Tim Kilbride, a DARPA spokesperson, told The Daily Beast.

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