"That's one unit and they'll be there (exhausted from Iraq duty) in a WEEK?"

I think she was just saying that there is a unit coming from Iraq to help. It may be only one unit but there are already many units there and will be many more to come. This is less then 24 hours since it hit. Also, they may be exhausted but they will be fine. This is what they do. They are trained for it and I bet NONE will complain.