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Yes, but you need to be prepared to take it to court when someone uses your software in war.

and when the answer is “hey, it’s GPL’d, here’s our source download link, fuck off we’re exactly following the rules”?

Licenses are not a viable solution to this sort of ethical quandry.

That answer should be unsatisfactory to the court, since it wasn't licensed under the GPL. The rules, in this case, say no use in war.