President Obama introduces (from third from right) Army Gen. Martin E. Dempsey, the next chairman of the Joint Chiefs of Staff; Adm. James A. Winnefeld, the new vice chairman of the Joint Chiefs; and Gen. Ray Odierno, the next Army chief of staff, during a Rose Garden ceremony at the White House in Washington on Monday, May 30, 2011. Also pictured are (from left) National Security Adviser Tom Donilon and Defense Secretary Robert M. Gates. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

President Obama introduces (from third from right) Army Gen. Martin E. Dempsey, the next chairman of the Joint Chiefs of Staff; Adm. James A. Winnefeld, the new vice chairman of the Joint Chiefs; and Gen. Ray Odierno, the next Army chief of staff, during a Rose Garden ceremony at the White House in Washington on Monday, May 30, 2011. Also pictured are (from left) National Security Adviser Tom Donilon and Defense Secretary Robert M. Gates. (AP Photo/Charles Dharapak)