New South Wales
I'll answer with the relevant rules quotes:
If for example the rebel assigns 2 leaders to a mission and there is already a rebel leader in the system can the rebel player roll dice counting the icons in all 3 rebel leaders present in the system?
RRG - Mission Cards wrote:
Each player rolls a
number of dice equal to the combined number of skill icons
on all of his leaders in the system whose skill icons match the
mission card’s skill.
Does the base count as a system with system loyalty for the purpose of objective cards?
RRG - Rebel Base wrote:
The “Rebel Base” space is not a system.