gbu-28

Noun
  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 (synset 102924169)
    is an instance of: laser-guided bomb, lgb - a smart bomb that seeks the laser light reflected off of the target and uses it to correct its descent
    same as: bunker buster, guided bomb unit-28

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