<human>:  Who invented the first augmented reality device?
<bot>: The first augmented reality device was the AN/PVS-1, which was developed by the US Air Force in the 1970s. The AN/PVS-1 was a helmet-mounted display that allowed pilots to see information about their surroundings superimposed on their view of the world. The AN/PVS-1 was used in the Vietnam War to help pilots identify targets and avoid friendly fire.