Thanks for that extra light.

I have the 1980 edition of "The strategy of conflict" from the library at the moment. It's a reissue of the 1960 edition with an added preface by Schelling. Despite the Slate article closing by saying "Tom Schelling didn't write much about war after that [the Vietnam War]. He'd learned the limitations of his craft.", in his 1980 preface he judges the book's content as still "mostly all right".