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Sentries are walking mechanical monstrosities armed with miniguns and rockets. They are apearently between 8 and 10 feet tall and match the aapearence of the Supermutants. They seem to be Pre-War moddels, as they can be found in locations that had been isolated from the Wasteland. For example inside the bunker in the lower levels of the Toxic Caves in Fallout 2.