ELLSWORTH AIR FORCE BASE, S.D. -- Staff Sgt. Darryl Wilcken, 28th Civil Engineer Squadron explosive ordnance disposal journeyman, prepares detonation cord for a ring-line explosion during a routine training exercise, March 30. Sergeant Wilcken is participating in training that will prepare him for real-world situations. (U.S. Air Force photo/Airman 1st Class Matthew Flynn)