FAREWELL TRIBUTE President Barack Obama, Vice President Joe Biden and Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, listen as Defense Secretary Chuck Hagel offers remarks during the Armed Forces Farewell Tribute Obama hosted for him on Joint Base Myer-Henderson Hall, Va., Jan. 28, 2015. Hagel is the 24th defense secretary. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 538351-C-RAG80-274.jpg Photo Gallery