From publisher blurb:
Welcome to High Guard.
This book is a major expansion to the Traveller roleplaying game, enabling you to design, build and fly spacecraft of all types found throughout the galaxy. You will find rules to modify existing ships, design high performance space superiority flyers, and construct the largest capital ships to travel the space lanes.
High Guard also presents new approaches to handle spacecraft operations, from engaging in vicious boarding actions to spacecraft security, from employing a range of warheads in missiles to accessing technologies seen in science fiction settings beyond the Third Imperium. Your warp drives await.
With more options and more powerful weapons, High Guard returns to space combat and provides a rules framework to use in epic space battles, from spiralling dogfights involving just a handful of lightweight fighters to the clash of heavily armed battleships across a front stretching through an entire star system.