The unattended ground sensor (UGS) is under development as part of the United States Army's Future Combat Systems Program. For information on currently fielded UGS systems, refer to the Current Force UGS Program or CF UGS. The CF UGS program includes a family of sensors from various companies: E-UGS, Silent Watch, Falcon Watch, Scorpion, OmniSense and OmniSense-Enhanced. The current sources for CF UGS are Applied Research Associates (E-UGS), Harris Corporation (Silent Watch, Falcon Watch), Northrop Grumman-Xetron (Scorpion), McQ Inc (OmniSense, OmniSense-Enhanced).