Looks like a dry topic but is not. The book begins with a short discussion of important questions that arose in England at the outset of WW II, regarding defense and offense, but as it goes on we suddenly find that it is directly pertinent to our times. Here's a tasty tidbit:
"...all countries can learn from each other's experience...[difficulty about] choices will at least be minimized as soon as all politicians and administrators are scientifically educated, or at any rate not scientifically illiterate."
Not there yet, are we? And the book was published in 1960. It's a well written transcription of lectures by the author, trenchant and even at times humourous.