Aimee McLaughlin and Kristina Schultz, biologists with the U.S. Army Corps of Engineers Pittsburgh District, dig a soil sample along a hiking trail at Tionesta Lake in northwestern Pennsylvania, July 24, 2023. The biologists belong to a team inspecting a proposal to reroute the trail through federal lands near the lake. The Environmental and Cultural Resources Section includes biologists, environmental specialists, physical scientists, environmental engineers, archaeologists, a tribal liaison, and a historian. Their mission includes protecting natural resources, wetlands, waterways, and locations of archaeological value. (U.S. Army Corps of Engineers Pittsburgh District photo by Michel Sauret)