Drone (IMAGE) U.S. Army Research Laboratory Caption A UAS outfitted with both a marker strobe (inset) and a traditional survey prism used to evaluate the accuracy of the motion-capture system. Credit U.S. Army photo Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.