"An internally-mounted rack of 4 optically-guided Small Diameter bombs. Each bomb has folding wings that allow it to glide for long distances and hit targets with precision. Advanced optics allow it to track moving targets from extended range without laser designation." -- In-Game Description[]
The GBU-53 is a type of guided Small Diameter bomb available exclusively to the F-45A. It is an advanced alternative to the conventional GBU-39 SD bombs with further versatility. The most notable advantage it has over the GBU-39 is that it is not GPS-guided; instead, it is deployed using the F-45A's EOTS (TGP), much like the GBU-12. The most important note about the GBU-53 is that it contains a built-in optical targeting system like the AGM-145 Ballista, giving it full fire-and-forget capabilities against moving targets. Consistent lock is not required for any targeting.
Like other GBUs, its guidance package can be disabled entirely through the F-45A's SMS page to allow it to function like an unguided bomb.