Hospitalmen (HN) perform duties as assistants in the prevention and treatment of disease and injury, including first aid and preventive medicine procedures; assist with physical examinations; provide patient care and the administration of medicinal and parenteral solutions; perform general laboratory, pharmacy, and other patient support services; assist in the administrative supply and accounting procedures within medical departments ashore, afloat, and with the Marine Corps; instruct medical and non-medical personnel in first aid, self-aid, personal hygiene, and medical records maintenance and assist in the transportation of the sick and injured; assist in the maintenance of environmental health standards; and are prepared to assist in the prevention and treatment of Chemical, Biological, and Radiological (CBR) casualties and other contingencies.