Secretary of Defense Chuck Hagel delivers his farewell address during the Armed Forces Farewell Tribute to Hagel on Joint Base Myer-Henderson Hall in Arlington, Va., Jan. 28, 2015. President Barack Obama hosted the event, which included remarks by Biden and Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff. (DoD photo by Petty Officer 2nd Class Sean Hurt/Released)