From the back of the book:
The most powerful regiments are comprised of Battlemechs and MechWarriors. All are steeped in tradition, honor, and duty. A single BattleMech can level a city, and can only opposed by another of its kind. Piloted by the elite class known as MechWarriors, these machines, when organized into regiments, are a force to make planets tremble.
Regiments are built on pride. A regiment's color embody that pride. The Guide to BattleTech Regimental Paint Schemes provides the distinctive pattern and colors, as well as a description of selected regiments of the Inner Sphere.
Includes 44 full-color illustrations, including several 'Mechs, tanks, and other vehicles in Arctic, Woodland and Desert camouflage schemes.