ELLSWORTH AIR FORCE BASE, S.D. -- Tech. Sgt. Elizabeth Nagy, 28th Bomb Wing equal opportunity NCO in charge, performs chest compressions on a child-sized dummy during a heart-saver certification course, April 20. When performing cardio pulmonary resuscitation on a child, five sets of 30 chest compressions must be performed before contacting emergency responders. Depending on the size of the child, chest compressions may need to be performed using one hand. (U.S. Air Force photo/Airman 1st Class Matthew Flynn)