Final answer:
The unit type code is the Chemical, Biological, Radiological, Nuclear (CBRN) defense unit which is primarily deployed or activated when there is a threat of chemical, biological, or nuclear hazards. They also provide military support to civil authorities.
Step-by-step explanation:
The unit type code primarily deployed or activated whenever a chemical, biological, or nuclear threat is present or developing, and also for military support to civil authorities, is the Chemical, Biological, Radiological, Nuclear (CBRN) defense unit. These units are responsible for detecting, identifying, and protecting against hazardous materials and weapons of mass destruction (WMD). They have specialized training and equipment to respond to CBRN incidents, including decontamination procedures and the handling of CBRN defense equipment.