Which GBU is designed to engage moving targets?

• A. GBU-31
• B. GBU-39
• C. GBU-53
• D. GBU-38

Answer: (C)

Engaging moving targets requires a weapon with an onboard seeker and a mechanism to update guidance during flight so it can track and hit maneuvering targets. The GBU-53/B Small Diameter Bomb II fits this need with a tri-mode guidance system that includes an imaging infrared seeker capable of target recognition, a two-way data link for mid-course updates, and GPS/INS guidance. This combination lets the weapon identify a moving target, track its movements, and adjust its flight path to maintain a hit despite target maneuvers. Other options rely mainly on GPS/INS and lack a moving-target seeker or real-time target updates, so they’re intended for stationary or preplanned targets rather than moving ones.