For me, this book was a fine introduction to what makes up today's armored cav--the armored vehicles, the weapons, the personnel, the training and the missions. I was especially impressed by his discussion of how GPS works. However, I felt that Clancy was weak on the history of the development of armored cav. I would have liked to have seen more discussion of how armored cav evolved from say, World War I through World War II, Korea, Vietnam right up to today. Clancy did a wonderful job of discussing the development of the submarine in his first nonfiction work SUBMARINE, and he would again talk about the history of the Marine Corps in his book about the Marines. Similarly, he should have talked about the history of the development of armored cavalry--Clancy's already proven that it's quite fascinating. Also, as with his other nonfiction works (save for INTO THE STORM) this book could use an index. For example, I saw a reference to the Sherman Tank in the glossary in the back; however, I could not find any references to it in the book itself. With his novels, and with nonfiction works such as this one, Clancy has probably done more to introduce the public to today's military than anyone else. I hope he continues to write nonfiction books such as this one, and I plan to continue buying them.