U.S. Air Force Senior Airman Paola Maldonado, 633rd Medical Operations Squadron cardiopulmonary laboratory technician, uses an echocardiogram on a simulated patient during a training session at Langley Air Force Base, Va., Aug. 6, 2014. The ultrasound measures chamber sizes and blood-flow of the heart to diagnose potential health issues. Maldonado hails from San Antonio. (U.S. Air Force photo by Senior Airman Connor Estes/Released)