 During the Gulf War, the US Marines also used about 60 cheap battlefield mini-UAVs, the "BQM-174 Exdrone (Expendable Drone)", that were fitted with simple TV camera payloads for battlefield reconnaissance.The Exdrone was built by BAI Aerosystems of Maryland.It was mostly made of styrofoam, balsa wood, and plastics, and was powered by a chainsaw engine.