A few people pointed out in the season premiere review of Battlestar Galactica that Jammer might very well be a not-as-of-yet revealed Cylon. The tell-tale proof seems to be during the NCP graduation ceremony, where Duck detonates a bomb planted on himself that decimates everything and everyone in the area (or at least a great lot of them). The image above is taken from that very graduation, where Duck passes by Jammer. Obviously by the look on Jammer's face, he recognizes Duck, but does he figure out what's going on and hoof it out of there? Well, the next image may say he didn't.