From the book description:
Secret Gadgets and Strange Gizmos traces this evolving connection from the deadly innovations of the Union and Confederate forces to the top secret, high-tech inventions that are making military history today. Chronicling the hits, the misses, and the important technological advances produced by the U.S. military.
Actually, that description is rather dry. Try this: go to Amazon.com's page for Secret Gadgets and Strange Gizmos: High-Tech (and Low-Tech) Innovations of the U.S. Military and click on the book cover to "Look Inside". Check out the crazy gadgets like the gyroscopically controlled motorized unicycle shown above.