Unmanned Flight Three unmanned aerial systems fly at Edwards Air Force Base, Calif., Aug. 21, 2019. Members of the Air Force's Emerging Technology Combined Test Force test and develop UAS technology. SHARE IMAGE: Download Image: Full Size (1.29 MB) Tags: DOD Photo By: Air Force Staff Sgt. Rachel Simones VIRIN: 190821-Z-GB362-1134C.JPG Photo Gallery