I have been able to finish all the quests to help these guys out except for the sending troops from other bases. I have been able to do it at 2 of the 3 camps however Hsu in Camp McCarren will not do it and he gets rather rude in telling me this. He acts like I haven't helped him uncover and stop the spy but I did and I have the quest log to show it. However now I wonder if the way that quest ended is my problem and that is I killed the spy but wasn't able to save the train from the bomb. Oh also I am no longer idolized but rather the step up from smiling trouble so I wonder if this is the problem and if so can I ever get back to idol status? Anyone else have this happen or is there anything I can do that will change his mind?

If the monorail was blown up, try raising your rep with NCR.