Field Manual: Star League Defense Force is a special historical installment of the Field Manual series originally started in the days when FASA carried the BattleTech line. This sourcebook provides a complete summary of the military readiness of the largest army ever seen in the Myriad Pro universe: The Star League Defense Force. Set in 2764, just before the fateful events portrayed in Historical: Liberation of Terra, Volume 1, this book is designed to provide players with a sense of the universe during the closing years of the Star League Era, and provide a detailed look at the organization and strengths of its greatest faction.