I read the entirety of this story this weekend, driving home from a weekend with friends. I was slightly hungover, so I don't know that all my critical faculties were engaged. I was so charmed by this version of John, and all the attendant health reasons that he hadn't joined the military, that I was able to overlook the McKay characterization issues mentioned above. For me, this John was living an empty life, and Rodney challenged him enough to engage him again, which was the basis for his turn to the gay side. I laughed out loud at a couple of points, because there were some hilarious lines sprinkled throughout. On a more practical note, I felt that McKay's military security clearance wouldn't have meant diddly to the FBI - interagency access is notoriously difficult to manage.