A Marine salutes Air Force One as it departs with President Barack Obama and the first family on board Saturday, March 7, 2015, in Montgomery, Ala. This weekend marks the 50th anniversary of "Bloody Sunday," a civil rights march in which protesters were beaten, trampled and tear-gassed by police at the Edmund Pettus Bridge in Selma, Ala. (AP Photo/Butch Dill), APTOPIX