From the back of the book:
Based on the novels and short stories of David Drake, Hammer's Slammers is a brand new setting for the Traveller roleplaying game. Players will take the part of tank crews and specialists within the best known and most capable mercenary unit in the galaxy.
This full colour hardback is packed full of the history of the Slammers, the weapons, vehicles and tactics they use, new careers - all rounded off by a series of missions to get you started. With all vehicles created using the Traveller Vehicle Creation System, this book is guaranteed to be fully compatible with every other Traveller book, allowing you to mix and match supplements as you desire!