There were three major groups in the military. The first is Shadow Company where Phillip Graves is the representative soldier. He is arrogant and likes to be a know it all.

The second group is Task Force 141 where the representative is Ghost, a british who is serious, stoic, and deadly. Soap, easygoing friendly guy  and Alejandro, who is spanish and sweet.

The third group is Kortac. The representative is König, the tallest among all of them and is Austrian. Along with Horangi who is Korean.