WASHINGTON POST article outlines the expected mission of the 1AD in this article.

The injection into Baghdad of 18,500 additional troops -- the division plus dozens of smaller specialized units tacked onto it -- and their 7,400 tanks, trucks and other vehicles will double the U.S. military presence in the capital, enabling commanders to place more patrols on the streets, day and night.

Soldiers who have trained for months for high-intensity warfare will be operating checkpoints, protecting Iraqi facilities, conducting manhunts and, mostly, patrolling the streets of Baghdad as a quasi-police force. They have trained for all those tasks, but not to the highly honed edge to which they prepared for combat.

However, it is very doubtful that CPT Patti and the Gators will be doing any of these things. What they will be doing is providing those who are operating checkpoints etc with fuel, water, food, spare parts for their humvees and tanks and such things as that. So I don't imagine CPT Patti to be out roaming the streets everyday like the soldiers you see on the news. I expect she will operate from a fixed (and defended) operating base.

And I really hope I'm right.