Blast off
Senior Airman Patrick Heltne places a blasting cap into C-4, an explosive substance, March 13 at Balad Air Base, Iraq. The blasting cap, which is attached to shock tubing, is used to initiate unexploded ordnance detonations from a safe distance. Airman Heltne is a 332nd Expeditionary Civil Engineer Squadron explosive ordnance disposal technician deployed from Ellsworth, S.D. (U.S. Air Force photo/Senior Airman Julianne Showalter)