Airman 1st Class Carolina Lopez, 47th Medical Operations Squadron medical technician, simulates listening, looking and feeling for air on a training mannequin at the 47th Medical Group training classroom Oct. 23, 2014. Cardiopulmonary resuscitation is a lifesaving procedure that is performed when someone's breathing or heartbeat has stopped and is a combination of rescue breathing, which provides oxygen to a person's lungs, and chest compressions, which keep the person's blood circulating. (U.S. Air Force photo by Staff Sgt. Steven R. Doty)(Released)