Aero-Terms!
Along with the British A.T. (Aerial Target), one the earliest
guided missiles. Development of the Kettering Bug, under the
direction of Charles Kettering, began at the Delco and Sperry
companies in 1917. It was an unpiloted biplane bomber made of wood,
weighing just 270 kg, including a 135-kg bomb as payload, and was
powered by a 40-hp Ford engine.