Rocket manufacturer Morton Thiokol has created a new vice presidency to oversee improvements to its redesigned space shuttle booster motors.

Allan McDonald, who oversaw the booster redesign as vice president of engineering for Morton Thiokol's Space Operations Division, will become vice president of redesigned solid rocket motor modernization, said spokesman Rocky Raab.The move will take place after the next shuttle launch in mid-March.

McDonald was one of the Morton Thiokol engineers who unsuccessfully argued against the launch in cold weather, which investigators said hampered the sealing ability of rubber O-rings in the joint.