When Defense Secretary Robert McNamara vowed last year to make some economy dents in defense-spending, he promised President Kennedy savings of $750 million. Last week Manager McNamara reported that he had exceeded his goal. He had, he said, saved $1.1 billion. Examples of how:
> By shifting more than a million excess Air Force rockets to the Army, which needed them for its attack helicopters, he saved the $41 million that new rockets would have cost.
> By substituting commercially available hydraulic "mules" for the specially designed electronic apparatus used to shut the doors of Minuteman missile silos, he cut the cost...