What does HS stand for in the context of naval ratings?

In the context of naval ratings, HS stands for Health Service Technician. This designation refers to personnel in the naval service who are trained to provide medical and health support to the crew. The role encompasses a wide range of responsibilities, including patient care, medical administration, and emergency medical response, ensuring the health and well-being of service members aboard naval vessels.

This designation is distinct from other options listed, as "Health Services" could refer to the broader field of medical care rather than a specific rating. "Hospital Staff" is more of a general term that does not specify the technical skills or military training associated with HS. "Hygiene Specialist" also describes a specific function within health services but does not accurately represent the full scope of responsibilities encompassed by Health Service Technicians. Thus, the designation correctly aligns with the specialized skills and training provided to those in that particular rating within the naval service.