DC 21.1 is a command and control exercise conducted in a simulated deployed environment designed to enhance the interoperability between II Marine Expeditionary Force command element staff and its higher, adjacent, and subordinate command headquarters including, 2nd Marine Aircraft Wing (2nd MAW), 2nd Marine Division (2nd MARDIV), 2nd Marine Logistics Group (2nd MLG) and II Marine Expeditionary Force Information Group (II MIG).