Elizabeth Mayo and Hannah Keppler, park rangers with the U.S. Army Corps of Engineers Pittsburgh District, unhook a boat from a trailer during the Motorboat Operator Training Course at Crooked Creek Lake in Ford City, Pennsylvania, Aug. 3, 2021. The 24-hour course included training on watercraft safety, a swim test, inflatable life jacket certification, boat launching, obstacle courses and a written exam. (U.S. Army Corps of Engineers Pittsburgh District photo by Michel Sauret)