Hello again! I'd like to add another flag to my Commonwealth project.
Here we are with the flag of the Mars Federation.
Obviously the large sphere represents Mars itself. The Two smaller spheres on the right represent Mars's moons Phobos and Deimos. The three yellow stars represent the first three major colonies that were established on Mars, and the yellow and black bands are decorative. Red, yellow, and black make up the governmental colors.
The federation itself is a governing administrative entity within the commonwealth that takes care of the planetary government for Mars. Martians themselves are very patriotic particular people. One could liken them to how Texas views its "independent" state of mind. At one point Mars did rebel in the years before the Commonwealth was fully established. However after a somewhat short civil war the Mars rebellion was hushed and was admitted as a federation into the Commonwealth. mind you this was not done without giving the Martian people a healthy dose of autonomy.
But I talk too much, enough with that.