Knowledge and skill in performing support duties for complex diagnostic tests and/or specialized practices or procedures, which include preparing the patient, assisting in the diagnostic examination, preparing and handling specialized instruments or other specialized equipment, and monitoring the patients condition before, during, and following the procedure. The VAs "Fourth Mission" is to improve the Nations preparedness for response to war, terrorism, national emergencies, and natural disasters by developing plans and taking actions to ensure continued service to Veterans, as well as to support national, state and local emergency management, public health, safety and Homeland Security efforts.