Mitochondrial DNA analyst Christina Miller sands a bone sample to remove surface contaminants before grinding it into a fine powder and extracting its DNA. DNA testing has developed to become a key piece of evidence in nearly 85 percent of all missing troop identifications. DoD photo by Fred W. Baker III Mitochondrial DNA analyst Christina Miller sands a bone sample to remove surface contaminants before grinding it into a fine powder and extracting its DNA. DNA testing has developed to become a key piece of evidence in nearly 85 percent of all missing troop identifications. DoD photo by Fred W. Baker III SHARE: Download: Full Size (0.38 MB) Credit: VIRIN: 177050-A-HMY74-142.jpg Photo Gallery