Argentine President Cristina Fernandez De Kirchner is greeted by members of the Argentinean delegation on the flight line at Joint Base Andrews, Md., April 9, 2010. Many heads of delegation are scheduled to fly in to Joint Base Andrews on their way to the Nuclear Security Summit hosted by President Barack Obama in Washington, D.C., 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 Melissa V. Brownstein)