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Longman Dictionary of Contemporary English
park ranger
noun
EXAMPLES FROM CORPUS
▪ A man found her wandering around and took her to the park ranger, who called the police.
▪ Behind the desk was Jim Bell, the voluble park ranger in charge of the one-room visitors center.
▪ Besides hiring more recreation leaders, Brown said the city should assign a park ranger to Chollas Lake at least on weekends.
▪ Newman, who worked part-time as a Cheltenham school crossing guard and park ranger, has no prior record.
▪ Only one structure, the Rotchev House, is original, park ranger Bill Walton says.
▪ We got away and were finally rescued by a park ranger.
Wikipedia
Park ranger

A park ranger, park warden, or forest ranger is a person entrusted with protecting and preserving parklands – national, state, provincial, or local parks. "Parks" may be broadly defined by some systems in this context, and include protected culturally or historically important built environments, and is not limited to the natural environment. Different countries use different names for the position. Warden is the favored term in Canada, Ireland, and the United Kingdom. Within the United States, the National Park Service refers to the position as a park ranger. The U.S. Forest Service refers to the position as a forest ranger. Other countries use the term park warden or game warden to describe this occupation. The profession includes a number of disciplines and specializations, and park rangers are often required to be proficient in more than one.