Did Skippy break the Rules of Engagement in Brushfire?

In book 1, Columbus Day, ch. 3 (I started the series over after finishing Brushfire, don't have any new audiobooks on deck right now), Joe is explaining the Rules of Engagement, such as no antimatter weapons, that both sides *usually* stand by. Rule #3 is no nano-weapons - did Skippy break this rule through his DNA-encoded-nano-machine-bomb-thingy's in Brushfire?