Book 5: High Guard applies the Mercenary expanded character generation concepts to the interstellar navy, and adds an expanded ship design and ship combat system.

For Classic Traveller, the term Books has a special meaning, presenting additional rules on specific subjects, expanding on Traveller's basic concepts. Books run 48 to 56 pages and may be used independently or together, but all require the basic rules sets.

Includes PDFs of both the 1979 and 1980 releases.