Why some Apollo missions carried a grenade launcher, per a Space Stack Exchange question

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A question posted on Space Stack Exchange asks why certain Apollo missions were equipped with a grenade launcher. The item was shared on Hacker News, where it gathered 22 points and 10 comments. The source material provided is limited to the question and its metadata, so the underlying answer is not included here. Readers seeking the explanation would need to consult the original Space Stack Exchange thread.

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