An RQ-21 Blackjack launches over an airfield at Naval Air Station Patuxent River to support the first flight test of Guardian, a new ground-based detect and avoidance system that tracks both manned and unmanned aircraft. Intended to help Naval Aviation prepare for the MQ-25 Stingray's arrival for developmental test at Pax, Guardian helps unmanned air vehicle operators monitor air traffic congestion to advance range safety. Developed by Navy engineers and test pilots, Guardian is only system that meets the Federal Aviation Administration's performance standards for unmanned systems. (U.S. Navy photo)