Helicopter rescue crews from Davis-Monthan Air Force Base - barely back home in Tucson after helping victims of Hurricane Katrina - took off for Texas on Friday to brace for Hurricane Rita. About 75 airmen from D-M's 563rd Rescue Group left for Randolph Air Force Base near San Antonio, along with three HH-60 Pave Hawk rescue helicopters and two HC-130 Hercules aerial refueling planes. The crews, specially trained to conduct search-and-rescue operations, have spent the last few weeks plucking people off rooftops in New Orleans and other areas stricken by Katrina. Most crew members had just returned to Tucson in...