Hannah Keppler fends off Matthew Balas, park rangers with the U.S. Army Corps of Engineers Pittsburgh District, during a training session on self-defense tactics at Crooked Creek Lake in Ford City, Pennsylvania, June 15, 2021, as part of a five-day Visitor Assistance course. District rangers who complete the course earn their park ranger badge and citation authority to enforce Title 36, which covers rules and regulations on federally owned parks and forests among other properties. (U.S. Army Corps of Engineers Pittsburgh District photo by Michel Sauret)