Having now obtained what he needed to cement his status as a war hero, the ruthless officer betrayed Task Force 141 in an attempt to destroy any links to his treacherous actions including his connection to Allen's death so he could bring Makarov down himself.
He is originally an ally to Task Force 141, but due to them coming closer to finding out the truth about the American ballistic missiles that Graves and Shepherd lost, Graves betrays the team on Shepherd's orders. After he escaped from the JTF-Ghost Team, Graves went hiding.