ADVANCE FOR WEEKEND USE OCT. 15, 2016 AND THEREAFTER - In this Thursday, July 7, 2016 photo, Yellowstone National Park ranger Mike Vogel talks about the science behind Old Faithful's eruptions from the boardwalk around the geyser in Yellowstone National Park in Wyoming. Working for the National Park Service can be a calling or a quest for adventure, but for most, wearing the uniform produces a sense of pride. (Raymond Hillegas/The Cody Enterprise via AP)
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