GS-4: Employees may be appointed at or advanced to GS-4 if they meet any of the criteria in (a) thru (c) below:(a) Six months of qualifying experience as an LPN or LVN;or(b) Graduation from an approved school and one year of experience that involved nursing care work in a hospital, outpatient clinic, nursing home, or other supervised medical, nursing, or patient care facility that provided a practical knowledge of human body structure and sterile techniques and procedures;or(c) Graduation from an approved school of at least 24 months duration.(d) 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.