Which bomb is used as a warhead for all GBU-12 models?

The GBU-12 models utilize the Mk-82 bomb as their warhead. The Mk-82 is a 500-pound general-purpose bomb that serves as the baseline for several guided bomb units, including the GBU-12, which is a laser-guided version. This combination allows for precision targeting while maintaining the explosive capabilities of the Mk-82.

In contrast, the other options represent different types of bombs or warheads that are used in various applications. The BLU-117 is a larger warhead (more commonly associated with the GBU-16 and GBU-24), while the BLU-109/B is a penetrator bomb designed for deep targeting and is used with different munitions such as the GBU-27. The GBU-24A/B, though a guided bomb, uses a different warhead than the Mk-82. Thus, the Mk-82's role as the warhead for GBU-12 models emphasizes its significance in precision strike capabilities within munitions systems.