Mars, Like Titan, the planet Mars has been colonized. In the backstory of the series, there was a war between Mars and Titan which eventually ended with the formation of a treaty two years prior to the current day. Part of the treaty prohibits Mars from building weapons, which would seem to imply that they lost the war. Despite the two having entered peace and working together, the two sides still clearly hold some animosity for each other. Like when Gibbs was terrorizing Mars, Mars blames planet Titan for having Gibbs as a rouge agent.