President Barack Obama, accompanied by Marine Gen. Joseph Dunford Jr., center, and Air Force Gen. Paul Selva, speaks in the Rose Garden of the White House in Washington, Tuesday, May 5, 2015, to announce that he will nominate Dunford as the next chairman of the Joint Chiefs of Staff and Selva as vice chairman. Obama chose the widely respected, combat-hardened commander who led the Afghanistan war coalition during a key transitional period during 2013-2014 to succeed Army Gen. Martin Dempsey. AP