Gen. Dempsey chosen to head Joint Chiefs of Staff

AP Photo/Charles Dharapak

First lady Michelle Obama greets

Bob and Elizabeth Dole before President Barack Obama speaks at the

Memorial Day ceremony at Arlington National Cemetery, Monday.

WASHINGTON — President Barack Obama moved Monday to seal an overhaul of his national security team, selecting Army Gen. Martin Dempsey as the next Joint Chiefs of Staff chairman amid protracted battle in Afghanistan, U.S. involvement in the NATO-led effort against Libya's Moammar Gadhafi and a winding down of the war in...