nterstellar Operations is the final installment in the award-winning line of BattleTech core rulebooks. Scaling up to a level of play that allows for the conquering of entire factions, Interstellar Operations allows players to scale between all the various BattleTech rulebooks, from a single warrior to regiments on the march. It's Alternate Eras section is one of the most anticipated parts of the book, including a slew of technologies across the centuries, such as the much anticipated return of the Land-Air 'Mech with full rules for play and construction.