SAN ANTONIO -- Part of the huge medical center at Keesler Air Force Base, Miss. -- closed by Hurricane Katrina damage -- could open sooner than base officials estimated less than a week ago. The section, on the hospital’s first floor, could open in as little as two months, said Brig. Gen. (Dr.) James J. Dougherty, 81st Medical Group commander. But it will still take at least six months to completely reopen the Air Force’s second largest medical center, he said. The hurricane knocked out the center’s ability to provide tertiary care -- highly specialized skills, technology and support services....