He was working as a medic on the battlefield.

This restaurant is very hygienic.

Public health nurses are working to protect the health of the community.

I'm going to the nurse's office because I have a headache.

World War I was a large-scale war that lasted from 1914 to 1918.

World War II lasted from 1939 to 1945.

Let's pray that World War III does not occur.

Every weekend, I do volunteer work at a local shelter.

He is known as an activist for environmental issues.

He is a very active person.