This book is about national security what it is, what its objectives are, what problems it seeks to solve or at least manage, and what kinds of influences constrain and create opportunities for the developemt ad implementation of strategies.
A good way to get reacquainted with strategic theory--so of course the Clausewitz and the Sun Tzu--but also the Goldwater-Nichols and the Mao are here. It's short(ish), it's clean, and it's very useful. The book was compiled in 2006, when we took things for granted like Pax Americana and keeping faith with our best Allies (a.k.a., the ones that mobilized on 12 September to put forces in Afghanistan in support of Article V), so I believe it's well worth the time and effort today to crack it open and reinvigorate the debate about the rights and responsibilities the First World took on in 1945. A solid read for national security types and military historians.
A must read for students of international relations an strategic studies. The book offers good knowledge about the relation between political and military dimensions of making national security policy.