Perry also ordered 1,750 Army and Air National Guard personnel to position themselves as Joint Task Force Rita between Austin and San Antonio, a Guard spokesman said. The task force members are experts in medical and rescue operations, transportation, supply distribution, security and road clearing missions. Among their equipment will be 11 military helicopters and four C-130 transport planes.In addition, the Texas Air National Guard will begin flying Katrina evacuees from vulnerable shelters in Houston to Fort Chaffee, Ark., and a site in Tennessee, a FEMA official said.