Jeffrey Earnhardt, right, NASCAR Nationwide Series driver of the No. 4 JD Motorsports Chevrolet, listens to James Canik, Armed Forces Medical Examiner System deputy director for administration, facilities and support, Armed Forces DNA Identification Laboratory, May 28, 2014, at Dover Air Force Base, Del. Earnhardt was briefed on how mitochondrial DNA is used to identify remains as part of forensic DNA testing procedures. (U.S. Air Force photo/Roland Balik)