UAVs (IMAGE) U.S. Army Research Laboratory Caption Army researchers identify new ways to make small UAVs like PUMA quieter in densely-populated areas. Credit Sgt. Hillary Rustine 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.