I really liked Charles Kawalsky (not only because he's last name sounds a little bit like Polish "Kowalski") - real soldier, faithful to his commander, who is not affraid of an open battle, and fears the "enemy within".
The best scenes of this episode were the ones with RDA and Acovone - you can really feel emotions, when Kawalsky, soldier, cries because of a small parasite inside his body, and when he asks Jack to cremate him after his death. There was no battle scenes and yet I really enjoyed this episode, because of its acting, emotions and how it kept me in suspense. Great three-episode start for the series that I fell in love with.
Sorry for my English, best wishes from Poland