Unnofficially labeled 'Book 1', though that title didn't make it onto the actual printed book.

Mercenary is a detailed expansion for the Traveller game, and the first in the line of Core Supplements. With advanced options for Soldier and Marine characters, any player with an interest in infantry combat will find something of value in this manual.

With new weapons and tactics, career options, and the lucrative mercenary ticket system, Mercenary puts ground combat front and centre.