Civil Defense Unit is a unit of the Department of Surface Operations of the Army of the Southern Cross. This division is used as a basic civilian policing force. They are assigned to protect the local cities and encampments and provide a high profile for the Army of the Southern Cross and the United Earth Government. They work in conjuction with Civil Defense Flying Corps
- The emblem used in Robotech Art 1 for the Civil Defense Unit is actually the emblem for the Civil Defense Flying Corps.
- The Civil Defense Unit is called "Cities Defense Unit" in Super Dimension Calvary: Southern Cross