From the back of the book:
No mercenary regiment is more well known, nor as universally respected. Indeed, other units of the Inner Sphere validate their prowess by surviving an encounter with the Dragoons.
This ComStar document is the most accurate, up-to-date assemblage of information ever compiled about the Dragoons. Their history, organization, and unique membership are exposed in great detail. Find out the who, what, where, when, and why(s) of the most powerful regiment in the Inner Sphere today.