Alpha Tactical Armored Corps (ATAC) is the elite unit of the Department of Surface Operations (ground forces) of the Army of the Southern Cross assigned the task of piloting the remarkable VHT-1 Veritech Hovertank - a transformable heavy armored personnel combat vehicle. The Alpha Corps is able to work with most of the various divisions of the Army of the Southern Cross' other tactical groups. Only the best soldiers are inducted into the Alpha Corps.