Playing around with some character concepts, and had this thought, particularly in light of the most recent Order 66 podcast and their discussion of the Age of Rebellion Beta.
In short, Chris and Dave raised a concern that Knowledge (Galactic Civil War) was perhaps too broad of a skill, since it could be rolled for anything that involves the Empire or the Alliance, even if such information isn't strictly military in nature, and begins pushing the other Knowledge skills to the wayside, particularly in an AoR campaign where the major adversary most of the time is the Empire.
So how about changing the skill to be Knowledge (Warfare) instead? In this case, the skill would cover those aspects related to war, such as Imperial war strategy or Alliance deployment methods but also general tactical planning and famous/noteworthy battles. It won't tell you much about how the Imperial legislature works (Core Worlds) or Imperial methods for detaining criminals (Underworld), both of which could be easily covered under Know (Galactic Civil War) as its currently written.
It also opens up the skill for usage in games that are not set during the Rebellion Era, such as the SW:TOR MMO setting or Legacy Era.