Piasecki Aircraft Corporation, developed, tested and flight demonstrated the world’s first fully autonomous capability on a man-rated helicopter using its KlearPath™ navigation/sensor system. The KlearPath™ System (Figure 1) enables rotary wing Unmanned Aerial Systems (UAS) to perform missions similar to those performed by manned utility and cargo helicopters. The Piasecki KlearPath™ system enables the UAS to fly at low altitude while avoiding obstacles; evaluate and select suitable landing sites in unmapped terrain; and land safely using a self-generated approach path. The KlearPath™ sensor development and testing was sponsored by the U.S. Army’s Telemedicine and Advanced Technology Research Center (TATRC) through the OSD SBIR Program, supplemented with significant additional funding from Piasecki. Popular Science Magazine selected the KlearPath system as one of the top 100 innovations of 2010.