Yes, but what is "behind the lines" in Iraq? I am sure that in a more conventional theatre of combat, the unarmored hummer does the job, but in a theatre such as Iraq, you need something lighter and more mobile than the Bradley (wheeled). Now, I wonder why the wonder machine (read Stryker) isn't the vehicle of choice. That is the real question.
Since there is no front line, the Hummers are being armored, but they aren't designed for the extra load, either with adequate transmissions, suspensions or engines.
However, we are making lemonade out of lemons with Yankee ingenuity.
I believe the very first Strykers have gone to Iraq, bypassing a lot of the ususal mock field testing.