Bulgarian air force paratroopers land at the drop zone after a successful static line jump from a U.S. Air Force C-130J Super Hercules in support of Thracian Spring 2011, April 28, 2011, in Plovdiv, Bulgaria. Thracian Spring 2011 is a two week on-site training designed to build partnerships between the U.S. and Bulgarian air force. (U.S. Air Force photo/Airman 1st Class Desiree W. Esposito)