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POTOMAC, MD - SEPTEMBER 8: Donald Sladkin, right, talks Ivan Chorines, 46, who hiked with his seven-year-old daughter Mallory on the Billy Goat hiking trail near the Great Falls in Potomac, MD, September 8, 2018. Sladkin is one of hundreds of volunteers who spend their days helping visitors in the C&O Canal park. But in the last few months, the Park Service removed the volunteer coordinator and made changes that volunteers say have made the park less safe for volunteers and visitors alike. Relations between the agency and volunteers have soured. Now, the Park Service is talking about overhauling the program -- and cutting the number of volunteers allowed in the park. (Astrid Riecken For The Washington Post via Getty Images)