AEROSPACE

Rockwell Exits Reusable Booster Program: Rockwell International Corp.’s space group in Downey said it plans to pull out of a venture to develop the X-34, a reusable small vehicle for launching commercial satellites. The venture, which also includes Orbital Sciences Corp., was working under the aegis of the National Aeronautics and Space Administration. Rockwell’s action follows its inability to reach terms on certain business arrangements with Orbital, a Rockwell spokesman said. But Rockwell is continuing development of a larger reusable launch rocket--called the X-33--that proponents hope will one day replace the Rockwell-built space shuttles for commercial launches.