Shephard

Brigadier General Mark Jamison Shepherd is the supreme commander of the Global Defense Intiative. Under his leadership GDI forces around the world waged the war against the Brotherhood of Nod during the First Tiberium War. Shepherd was a United States general before he was tapped to run the newly formed GDI. Shepherd was often absent from his command post for various reasons, and toward the end of the GDI campaign he showed great remorse when Kane eluded GDI during the battle over Nod's research center.

Interestingly, he has three stars, which by US standards would make him a Lieutenant General, not a Brigadier General. Furthermore, it would seem that the Global Defense Initiative, able to wage war on a world wide scale, was far more than a brigade-level unit. Therefore, it is likely that the listing of Shepherd as a 'Brigadier General' is to disguise the fact that he is the commander of GDI, that the scope of GDI is so large, or perhaps both.