 Navy DCs do the work necessary for damage control, ship stability, firefighting, fire prevention, and chemical, biological and radiological warfare defense.They also instruct personnel in the methods of damage control and chemical, biological and radiological defense, and repair damage control equipment and systems.After completion of "A" school, USN damage controlmen are assigned to ships of all types in the United States or overseas, TAR damage controlmen are assigned to NRF ships in CONUS.