. >>> a memorial day announcement a few hours ago the president named martin dempsy as joint chief of staff. the nominees need senate approval. >>> immediately following that announcement, president obama paid tribute to the nation's fallen heros at arlington national cemetery. the president laid a wreath at the tomb of the unknown soldier. he declared our nation owes our fallen heros a debt we can never repay. >> it's one of my highest honors. it's my most solemn responsibility as president to serve as commander in chief of one of the finest fighting forces the world has ever known. >> after he finished, he walked through a section of the cemetery reserved for veterans of the wars in iraq and afghanistan. earlier the president and first lady hosted a breakfast for families of troops killed in combat. in afghanistan troupes are remembering their fallen comrades. they held a candle light vigil to recognize the 1 -- 1,500 service members killed in the war. veterans marched into the parade ground. the army band played the national anthem and the crowd remembered those who died serving th