So, I'm checking out Camp McCarran, and I know there is a spy there, the Col. told me there was. Then I interrogate the Legion soldier and he tells that there is a spy as well. I know there HAS to be a quest to find this spy, but I can't seem to find whoever I need to talk to start it. Who asks you to find the spy, where do you find them?

I honestly have no idea what your talking about but it could just be an unmarked quest (theres a [censored]-ton of them) lol

I think it is an unmarked quest, but I still have have someone to give it to me, I think. There is this door to the radio tower, that I have to have a key to open, and I think it has something to do with this. Or do I just hide and stake it out, I already hacked the entry log, but it didn't tell me much.

You need speak with Colonel Hsu. He is on the first floor of the main building on the east end. He tells you to speak with Captain Curtis who is almost always on the west end of the first floor. Once you have spoken to Curtis. Head outside and speak with all the named NPCs around the parking lot. Eventuely you'll pick up a lead.

Can't remember if it is a marked quest but A LOT of the quests here in NV are marked. My journal is so crammed with quests I have something to do almost everywhere lol. I get sidetracked easily so i end up with 30 quests active at once.

Hope this helped you out.

Its a actual quest it comes from talking with one of casears guys i cant remember but i do know he is standing right by casear so it should be easy. But its not the first mission the guy gives you before you find the traitor he tells you to find someone in new vegas for him first. Sorry if it doesnt make sense to you but i have this quest on my game right now so i know im right.

I found Col. Hsu tucked away in a little room on the east side of the terminal (just where you said he'd be) and he gave me the quest. Thanks Selvo I appreciate the help.

A word of advice, leave the quest unfinished until the next update. Without giving to much away, even if you disarm the bomb on the monorail, the monorail will blow up anyway and you will have mixed responses (good and bad) from other npcs.

I figured this out, the monorail will explode anyway only if you do not eavesdrop on the conversation with the spy first. If you kill him before you hear him talk about the bomb, then it blows even if you manage to get to it and defuse it (I did this the first time, but loaded up an earlier save and went back and redid it) If you sneak in, and listen to him talk about the bomb, then it will not automatically explode.