"Low observable technology, widely known to the world as stealth, aims to reduce as much as possible the infrared, visual, acoustic, and radar signatures emitted by vehicles, whether they are seaborne, airborne, or on the ground. DARPA [Defense Advanced Research Projects Agency] has been instrumental in developing the technologies necessary to achieve these goals."
Defense Advanced Research Projects Agency: https://www.darpa.mil/
50 Years of Bridging the Gap; pp. 152-154