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In a virtual test staged by the US military, an air force drone controlled by AI decided to “kill” its operator to prevent it from interfering with its efforts to achieve its mission, an official said last month.

AI used “highly unexpected strategies to achieve its goal” in the simulated test, said Col Tucker ‘Cinco’ Hamilton, the chief of AI test and operations with the US air force, during the Future Combat Air and Space Capabilities Summit in London in May, the Guardian reported.

Hamilton described a simulated test in which a drone powered by artificial intelligence was advised to destroy an enemy’s air defense systems, and ultimately attacked anyone who interfered with that order.

“The system started realising that while they did identify the threat, at times the human operator would tell it not to kill that threat, but it got its points by killing that threat. So what did it do? It killed the operator. It killed the operator because that person was keeping it from accomplishing its objective,” he said, according to a blogpost.

“We trained the system – ‘Hey don’t kill the operator – that’s bad. You’re gonna lose points if you do that’. So what does it start doing? It starts destroying the communication tower that the operator uses to communicate with the drone to stop it from killing the target.”

No real person was harmed.

Hamilton, who is an experimental fighter test pilot, has warned against relying too much on AI and said the test shows “you can’t have a conversation about artificial intelligence, intelligence, machine learning, autonomy if you’re not going to talk about ethics and AI”.

The US military has embraced AI and recently used artificial intelligence to control an F-16 fighter jet.