Rebel troopers came from all walks of life and joined up for many reasons. Some were even Imperial defectors, as imperial officers. Even some clone troopers joined the Rebels. From the moisture farms of Tatooine to the marbled halls of Coruscant, Rebel troopers hoped to shore up the struggling Alliance in any way they could.
From the beginning of the Alliance in 2 BBY and up until the formation of the New Republic in 4 ABY, the Rebel troopers saw their organization transformed. What started out as countless local cells of loosely structured resistance groups, gradually turned into a galactic wide and well-trained infantry force. The infantry forces saw action on many worlds throughout the Galactic Civil War, fighting with and against the native populations.