From the back cover:
The Colonial Expeditionary Force is the interstellar fighting arm of the New Earth Commonwealth, and one of the main antagonists of the Heavy Gear universe. Equipped with advanced technology and vat-grown gene-engineered warriors, they are intent on subjugating the entire interstellar network of human-colonized worlds for the greater glory (and profit) of the Commonwealth! This sourcebook details the history, structure, procedures and equipment of this deadly foe.
This sourcebook includes:
A complete history of the Colonial Expeditionary Force.
Background details on strategies, uniforms, medals and procedures.