From the preview:
The battlefields of the galaxy are no place for the weak-willed. Warriors of countless species charge into war against the Empire oftentimes armed with with little more than a blaster, a grenade, and a stone-carved resolve. Fully Operational, the Engineer's sourcebook for your games of Star Wars™: Age of Rebellion, provides players and gamemasters with a trove of information about Engineers, those brave Rebels who provide an additional level of support for the cause with their technical skills and talents. The needs of the Rebel Alliance change daily, and Engineers must be ready to apply their knowledge in whatever capacity is necessary; creation and destruction are just two sides of the same credit chip.