Some of the nation’s top defense industry executives said at a forum at the Reagan Presidential Library on Nov. 16 that they have grave concerns about the nation’s ability to supply the workers needed to maintain the nation’s technological superiority. Shaky job security at defense firms, competition for talent from non-defense companies and a shortage of science and math graduates are making it hard to hire and retain the kind of skilled people who have made the United States a world leader in technology for decades, panelists said.