Redeployment to Iraq

My brother joined the military a few years ago to get job training and money to go to college after he gets out. So far he has been posted mainly in the United States, but now there is going to be a redeployment of his unit. He is being sent to Iraq, so we are all worried for his safety. We know a lot of people who have been in and out of Iraq, thankfully all of them safely, but we are especially worried for him since he works with the tanks and there have been a lot of casualties in Iraq.