Taking a Tour Deputy Secretary of Defense Dr. Kathleen H. Hicks meets with representatives of conservation groups during a tour of the Nanticoke River during a visit to Vienna, Md., April 22, 2021. SHARE: Download: Full Size (8.65 MB) Credit: Air Force Staff Sgt. Brittany A. Chase VIRIN: 210422-D-BM568-1799.JPG Photo Gallery