The TSFO (Training Set, Fire Observation) was designed to permit realistic instruction to forward observers in the observation and adjustment of artillery fire and fire planning. The TSFO simulated the visual and sound effects that an FO could expect to experience at an Observation Post when overlooking a typical battlefield. The TSFO could also be used for exercise planning, basic and advanced map reading, and terrain recognition training. The TSFO could simulate the effects of four 8-gun batteries, each equipped with 155mm howitzers with a variety of ammunition types including HE/Q, HE/VT, HE/ti, smoke, and illum. A variety of targets could also be simulated. These included machine guns, wheeled and tracked vehicles, and helicopters. The entire system could be operated by one person.