The first thirty pages is not very impressive, and the last 30 pages also tapers off into unimpressive theory. That being said, the remaining 150 pages is well written and imperative for all soldiers as well as policy makers.
I would categorize the book into four main points: first, that human nature determines fighting attitudes; second, that professional soldiers have largely ignored the first point and instead rely on unreliable mythologies; third, that social pressure and communication are often more important than technological superiority; and fourth, that policies should be implemented to emphasize the human factor and its limitations on the battlefield.
Quotes, in no particular order:
Page 50 - "Now I do not think I have seen it stated in the military manuals of this age, or in any of the writings meant for the instruction of those who lead troops, that a commander of infantry will BE WELL ADVISED TO BELIEVE [my emphasis] that when he engages the enemy not more than one quarter of his men will ever strike a real blow unless they are compelled by almost overpowering circumstances or unless all junior leaders constantly 'ride herd' on troops with the specific mission of increasing their fire. The 25% estimate stands even for well-trained and campaign-seasoned troops... it is an aspect of infantry combat which goes unheeded... This is a very curious oversight, inasmuch as the problem of how much fire can be brought to bear is the basic problem in all tactics. In fact... tactics are simply shaped around it."
Page 52 - "... it is a point of honor with professional soldiers to hold dogmatically to the belief that training conquers all, and that when perfectly drilled and disciplined, all men will fight. But what of human nature? In the workshop or office, or elsewhere in the the society, a minority of men and women carry the load of work and accept the risks and responsibilities which attach to progress [the Pareto distribution]; the majority in any group seeks lives of minimum risk and expenditure of effort, plagued by doubts of themselves and by fears for their personal security. When the deeper currents of life run counter to the proposition that a majority of men will engage willingly, it would not appear reasonable to believe that military training will succeed where other disciplines fail."
Page 66 - "We should take it that the initiative to fire is ONLY ONE positive quality in the good soldier. Notwithstanding that it is the mainspring of successful minor tactics and hence of final victory in war, those who are incapable of developing it are not to be too greatly discounted FOR THIS ONE FAULT."
Page 148 - "In the normal man it is an absolutely normal impulse to move away from danger. Yet within an army it is recognized by all that personal flight from danger, where it involves dereliction of duty, is the final act of cowardice and of dishonor... The majority are unwilling to take extraordinary risks and do not aspire to a hero's role, but they are equally unwilling that they should be considered the least worthy among those present... From that point, one could go on to say that social pressure, more than military training, is the base of battle discipline, and that when social pressure is lifted, battle disintegrates."
Page 148 - "An army is still a crowd, though a highly organized one. In times of great stress it is subject to the same laws which govern crowds and it is only the presence of strong control which keeps it from acting like a mob."
The author's last page can be paraphrased as such: The guardians of national security are civilians. It begins in the cradle and the nurturing of the child. It continues with the education and indoctrination of certain values. The emphasis placed on their society, their country, and all of mankind. These beliefs are imposed through politics and law. The need for soldiers ONLY comes when they are needed and their substance can ONLY originate from what they were before. In essence, an honorable and peace loving society with standards is the best way to ensure premium fighting forces when the need arrives.