Hospital staff and others wave as a convoy of cars follows the ambulance carrying Rep. Gabrielle Giffords , D-Ariz., from University Medical Cente in Tucson, Ariz., Friday, Jan. 21, 2011. Giffords is being moved Houston for further rehabilitation. It’s the first time Giffords left the Tucson hospital since she was brought there with a gunshot wound to the head. (AP Photo/Greg Bryan, Pool)