Chuck: I can't betray my best friend. How come nobody gets that?
Casey: Hmm. Semper Fidelis. Means always faithful in the Marines. In civilian life, means putting your friend's well being above your own. I salute you for that, Bartowski. Well done.
[Casey gives Chuck a small salute]
Chuck: Yeah, that's-- Thanks, Casey. Yeah. Semper Fi. You know it's a pretty upside down world when this guy's the one picking up the emotional nuances around here.
[Casey winks at Sarah]

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