Khalid Sheikh Mohammed and five other terrorists would be tried in a civilian court

[The Antagonist]

I think the "of your peers" simply means someone who is not appointed by a government official, works for the court system etc... a 'regular citizen' and not exactly a "peer" in the true sense of the word. If that were the case then any teenager on trial for whatever crime would have other teenagers on the jury deciding his faith. That would not work out well for the court system!