Damon is in costume as Francois Pienaar, the captain of the South African rugby team; The Human Factor is about Nelson Mandela in the years after he became president of the once-apartheid country and the lengths to which he went to unite his deeply divided nation. Hosting the 1995 Rugby World Cup was a way of doing that.
The Bad & Ugly have a whole bunch of pictures; head over there to see more photos of Matt Damon, a bunch of white dudes in shorts and little black kids.