US Vice President Dick Cheney's wife, Lynne Cheney (L), applauds as US Secretary of Defense Donald Rumsfeld's wife, Joyce Rumsfeld, was also honored during the Armed Forces Farewell Tribute to Rumsfeld at the Pentagon. Rumsfeld closed six tumultuous years at the helm of the US military with an appeal to Americans not to lose heart in a long and difficult struggle against extremism.(AFP/Getty Images/Chip Somodevilla)