cruise missile

Long-range guided missile that has a terrain-seeking radar system and flies at moderate speed and low altitude. It is descended from the German V1 of World War II. Initial trials in the 1950s demonstrated the limitations of cruise missiles, which included high fuel consumption and relatively slow speeds (when compared to intercontinental ballistic missiles - ICBMs) as well as inaccuracy and a small warhead. Improvements to guidance systems by the use of terrain-contour matching (TERCOM) ensured pinpoint accuracy on low-level flights after launch from a mobile ground launcher (ground-launched cruise missile - GLCM), from an aircraft (air-launched cruise missile - ALCM), or from a submarine or ship (sea-launched cruise missile - SLCM).