Which government entity collaborates with the Navy on public health regulations concerning sanitation?

The Centers for Disease Control and Prevention (CDC) is the correct answer because it plays a critical role in public health and sanitation regulations, specifically as they relate to vessels, including Navy ships. The CDC develops guidelines and standards to safeguard public health by controlling disease transmission and ensuring safe sanitation practices on these ships.

The agency is involved in enforcing standards for food safety, water quality, and overall sanitation in maritime environments. Their expertise is crucial in the context of the Navy, as they work collaboratively to protect sailors and the public from health risks.

Other entities, such as the Environmental Protection Agency (EPA), focus primarily on environmental protection and regulations, which includes aspects of sanitation but does not have the same direct public health focus as the CDC. The National Health Service (NHS) is a healthcare system in the United Kingdom and does not pertain to U.S. military operations, while the Department of Transportation is concerned with transportation infrastructure and operational safety, rather than sanitation matters directly related to public health. Thus, the CDC's involvement in public health regulation concerning sanitation on Navy ships makes it the most relevant entity in this context.