First it is important to put this book in perspective. It was written after the Marine Corps had dropped the LINE system as not preparing Marines for the demands of the modern battlefield and before the creation and adoption of the Marine Corps Martial Arts Program (MCMAP). It was also written before any lessons could be learned from the wars in Iraq or Afghanistan. It is a very simple book with a set of basic techniques that may not be the most important to learn first.The rest is simply my opinion so take it for what it is worth. The Marine Corps is full of very tough people. They are not tough because their hand-to-hand combat training is good. In fact, I would argue that their hand-to-hand combat training can be pretty crappy and the average Marine will still be pretty tough. This manual falls into that catagory.If you want to be tough like a Marine, join the Corps. You will certainly not learn how to fight like a Marine by practicing the techniques in this book.