Which of these bombs is designed with only a tail fuze well?

The BLU-109/B bomb is specifically designed with only a tail fuze well. This bomb is used for penetrating hardened or buried targets, and the design focuses on ensuring that the fuze is placed in a position where it can effectively initiate the explosive charge upon impact. The tail fuze well is strategically located to allow for the bomb's aerodynamic performance while targeting specific munitions requirements, particularly for missions that involve deep penetration and destruction of reinforced structures.

In contrast, other bombs such as the BLU-113/B, GBU-28A/B, and MK-82 feature different configurations and fuze placements, including options for nose fuzes. Understanding the fuze well designs is crucial for operational applications, as the choice of fuze influences detonation timing, target damage, and overall mission effectiveness.