Staff Sgt. Casey R. Williams, 89th Aerial Port Squadron special air missions agent, spots a set of stairs to the door of an Boeing 767 carrying the President of Chad, Idriss Deby, on the Joint Base Andrews flightline Aug. 3, 2014. The president arrived to attend the US - Africa Leaders Summit in Washington D.C. JBA members worked collaboratively with the Department of State, Secret Service and FAA, among others, to ensure the safe arrival and departure of distinguished visitors traveling to and from the summit via the airfield.(U.S. Air Force photo/Senior Airman Kat Lynn Justen)