Andy Ashley, director of the U.S. Army Corps of Engineers Mississippi River Science and Technology Office, USACE Mississippi Valley Division, and Mississippi River Commission, talks about the Navigation and Ecosystem Sustainability Program with participants of the 12th Mekong-Mississippi Sister Rivers Partnership Exchange Talks Dec. 9, 2024, in Nashville, Tennessee. The Sister Rivers Partnership Exchange supports the Mekong-U.S. Partnership (MUSP). (USACE Photo by Leon Roberts)