GBU-28

Definitions of GBU-28
  1. noun
    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
    synonyms: Bunker Buster, Guided Bomb Unit-28
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    example of:
    LGB, laser-guided bomb
    a smart bomb that seeks the laser light reflected off of the target and uses it to correct its descent
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