(talking about who would go back to Earth)
Sheppard: But if you wanna go, I'd understand that too.
Weir: What are you saying? I'm not needed here?
Sheppard: I said I'd understand.
Weir: Well, thank you, but I made a commitment.
Sheppard: Of course, in all fairness, life-sucking aliens weren't part of the brochure.