Blue Moon is one of the five main forces of Wars World. To date it has appeared in all installments except for Advance Wars: Days of Ruin/Dark Conflict (and the Japan-exclusive Game Boy Wars titles in which it is replaced with an army known as "White Moon"). Due to the actions of Clone Andy, they are at war with Orange Star at the start of Advance Wars, though later ally with them. They are also a member of the Allied Nations.
Blue Moon's commanding officers are:
- Blue Moon is modeled after the real world nation of Russia, as well as the Soviet Union. The irony of this is that in real life the Soviet army was known as the Red Army. While in the games, the opposing team is usually colored blue.