An added note about being a double agent!
Spoiler space...
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Sgt Kunar in the Umpani Commisary is a spy so you have to kill him after you get the flag in order for the T'Rang not to discover your double agent status!
He has a fake ID card...take it to Sgt Balbrak, talk about Sgt Kunar, answer "Spy", give him the card and you get EP's for discovering their weak link.
So far, this worked with keeping the T'rang from otherwise finding me out...now to figure out a way to keep all quiet wit the Umpani.