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How Eight Marines Broke a DARPA Person-DetectorAfter training the AI for days, the Marines were challenged to reach the robot without being detected. They used unconventional approaches outside the model’s training data: two somersaulted for 300 meters, two hid under a cardboard box, and another disguised himself as a tree. None of the eight were detected. The AI had been trained to detect people walking, not somersaulting, hiding in a box, or disguised as a tree—illustrating how brittle such systems can be when faced with behaviors they weren’t trained on.