Spartan Alison Bush was a UNSC Army trooper who fought in the last half of the Human-Covenant War. After the war's conclusion, Alison continued to serve in the Army until 2554, when she was given the opportunity to join the SPARTAN-IV Program. After training and augmentations, she was assigned to Fireteam Blitzkrieg, commanded by the former ODST Oliver Braun. She would fight with Blitzkrieg in many engagements in the post-war world, until late 2558, when the Created Crisis began. Blitzkrieg was folded into the Office of Naval Intelligence's Special Activities Division's Operational Detachment-Sigma, whose sole purpose was to help end the threat. Shortly after the unit's formation, they were deployed to the former colony world of New Zaječar to prevent the Created from gaining control of th