Chip Smith, assistant for Environment, Tribal and Regulatory Affairs in the Office of the Assistant Secretary of the Army for Civil Works, takes a question from Marsha K. Welch, an environmental archaeologist with the Tennessee Department of Transportation, during a presentation on the U.S. Army Corps of Engineers Program and Authorities for Tribal Nations during a workshop at the Estes Kefauver Federal Building Jan. 13, 2015 in Nashville, Tenn.