Navy, actually. From what I understand, he was supposed to be on a ship, but managed to get some kind of transfer so that he could be on the ground in Iraq.
The Navy has very few casualties in Iraq. Navy medics serve with the Marines, and Navy Seals are involved in special ops.
My Daughter was there with the Army and Cousin with the Marines (he was in some nasty fighting in ANBAR). They tell me we are winning.