The Advanced Small Diameter Bomb (XSDB) is a special weapon introduced in Ace Combat 7: Skies Unknown. Much like the 4 Target Air-to-Ground Missiles, the XSDB allows the user to lock onto and attack multiple ground targets at once.
Ace Combat 7: Skies Unknown
- "Homing bombs that can lock on to up to four targets simultaneously. They have a higher carrying capacity than anti-surface missiles and are more focused."
- ― Hangar
The XSDB model appears to be based on the GBU-39B/B, a variant of the SBD with a laser tracking sensor.