So I sent out my n600 application in July of 2015. After reading through posts in this forum, I tried to applied for a US passport. The department of state asked for my green card as proof that I was here legally the time my parents became citizens. I sent it in, and my passport was approved and the department of state sent me back a letter saying they would keep my green card. My n600 is still "at my local office" as of right now... I read that I'm required to give USCIS my green card when/if I get approved. How is this going to work? Will I be able to bring in my US passport instead? I'm happy that I got my passport, but now I'm a little worried about my n600 application.. Hopefully someone's been through this and can give me some answers. Thanks in advance!