Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Noun: GBU-28
  1. A 5,000 pound laser-guided bomb that can be programmed to penetrate to a given depth before exploding; used to penetrate hardened underground facilities
    - Bunker Buster, Guided Bomb Unit-28

Type of: laser-guided bomb, LGB

Encyclopedia: GBU-28