A fight line operations lead vehicle moves to the staging area to wait for the next incoming leader to arrive on the flight line at Joint Base Andrews, Md., April 11, 2010. World leaders arrived at Joint Base Andrews for the Nuclear Security Summit hosted by President Barack Obama in Washington, D.C., which is slated for Monday and Tuesday. The 316th Wing is leading operations to provide safe, effective, and efficient arrival and departure services for the invited guests transiting Andrews. (U.S. Air Force photo by Airman 1st Class Perry Aston)