Which statement correctly describes the relationship between GBU and dumb bombs?

• A. A dumb bomb plus guidance packages and control fin assemblies
• B. A dumb bomb paired with only a laser designator
• C. A dumb bomb with inertial navigation guidance only
• D. All Guided Bomb Units (GBU) are a combination of a "Dumb Bomb" and a guidance package

Answer: (D)

A Guided Bomb Unit is formed by attaching a guidance package to a standard unguided bomb body. The base bomb is the “dumb” part, and the guidance package adds the electronics, sensors, and tail/fin assembly that steer the bomb to a target. Different GBUs use different guidance methods—laser guidance, GPS/INS, or other navigation—depending on the specific kit, but in all cases the bomb is a dumb bomb plus a guidance package. An external laser designator isn’t part of the GBU itself, and some GBUs use GPS/INS rather than inertial guidance alone, so describing GBUs as simply a dumb bomb with a single type of guidance or as requiring extra designated equipment doesn’t capture the general relationship.