CXXI Corps

The 121st (CXXI) Corps is a special military formulation of U.S. Army assets hand picked from multiple divisions of the Army to be specially trained in small and large scale warfare against the infected hordes in Europe. Their combat doctrine was rigorously changed to suit both conventional warfare and warfare against the biological threats of the infected.

The CXXI Corps was comissioned at the same time as the Zenerium Anthovirium One (ZA-1) virus struck Germany.