Members of Bagram Airfield gathered at the Enduring Faith Chapel to celebrate Martin Luther King Day Jan. 15, 2018 at Bagram Airfield, Afghanistan. MLK Day is a federal holiday held on the third Monday of January. It celebrates the life and achievements of Martin Luther King Jr., an influential American civil rights leader who is most well-known for his campaigns to end racial segregation on public transport and for racial equality in the United States. (U.S. Air Force photo/Staff Sgt. Divine Cox)