She sang the song to celebrate Armistice Day, the anniversary of the end of World War One.
Clark, 43, spent more than 4 hours getting their 223 names inked onto his chest and back on November 11, the Armistice Day that marks the end of fighting of World War I.
The French want a joint commemoration of Armistice Day on November 11th.
Every Armistice Day until 2007, he attended ceremonies honoring deceased veterans.