Project team members, property owner John Walton and Col. Edward Chamberlayne, commander, U.S. Army Corps of Engineers, Baltimore District gather around the commemorative Sycamore tree during the commemoration of the Piscataway Creek Wetlands Mitigation Project at Poplar Hill Mansion in Clinton, Md., June 30, 2016. The Corps of Engineers has supported Joint Base Andrews in identifying an acceptable wetland mitigation site since 2010.