PRECIS-UNAVAILABLE SECRETARY OF DEFENSE: WE PERFORMED A LIMITED SURVEY OF THE NAVY'S CAR RENTAL PRACTICES AND RELATED MANAGEMENT CONTROLS AND HAVE OBSERVED THAT A LARGE NUMBER OF TRAVELERS. ARE CONTINUING TO OBTAIN VEHICLES IN CONNECTION WITH TEMPORARY DUTY ASSIGNMENTS FROM SOURCES OTHER THAN THE GENERAL SERVICES ADMINISTRATION (GSA) MOTOR POOLS OR PRIVATE CAR RENTAL FIRMS THAT OFFER REDUCED RATES...