{| |} The S-TEC Sentry is a reconnaissance UAV developed in the United States in the 1980s. Built by S-TEC systems of Texas (now part of DRS Unmanned Technologies), it is a battlefield mini-UAV in roughly the same class as the BAI Dragon drone. In fact, the Sentry looks something like an Exdrone with a twin-boom raised tail. It is built of carbon composition and Kevlar, and powered by a 19.5 kW (26 hp) piston engine in a tractor configuration. S-TEC has teamed with TRW Corporation in the US and IAI of Israel to sell UAVs on the international market.