The unmanned aerial vehicle industry is expected to bring in billions for domestic drone makers over the next few years. Where are the robotic aircraft manufacturers sending their stealth spy plans though? They aren’t saying.

The American Independent reports that Texas’ Vanguard Defense Industries, a US Defense Department contractor that outfits the Pentagon with unmanned aerial drones, has inked agreements with several overseas governments. According to the Independent, Vanguard is expected to see most of their profits in the next year occur from selling airships to foreign nations. Just exactly who is on the receiving end — and to the tune of how many crafts — remains a mystery.