U.S. President Barack Obama and First lady Michelle Obama greet military families and guests during an Independence Day celebration on the South Lawn of the White House in Washington

U.S. President Barack Obama and First lady Michelle Obama greet military families and guests during an Independence Day celebration on the South Lawn of the White House in Washington

U.S. President Barack Obama and First lady Michelle Obama greet military families and guests during an Independence Day celebration on the South Lawn of the White House in Washington July 4, 2015. REUTERS/Yuri Gripas