A national-security gender gap. (Comment).

We're hearing a lot about national security these days, but it's always defined in one-dimensional terms--as protection from external enemies. But there is another aspect of national security that is traditionally recognized as vital to any nation, and this is protection from the internal enemies of neglect, ignorance and despair. These may not appear to be immediate threats, but over time they can destroy a society. True homeland security requires a strong defense against internal as well as external vulnerabilities.

The two elements of national security have been linked since ...