When the CGS mercenary group is contracted to transport the leader of a Martian independence movement to Earth, they become the target of Gjallarhorn, a police-like organization which seeks to keep Mars under Earth’s control through any means necessary. Earth however is not united, and the mercenaries quickly become entangled in an elaborate political scheme.
A mecha action drama with child soldiers as the protagonists. Like many Gundam series it focuses on the themes of colonialism, prejudice, rivalry, and chains of revenge. Less common are the mafioso elements it eventually adopts.
More Information:
aniDB (1, 2)
Crunchyroll
Daisuki
Fansub.co
Wikipedia