WORKING DOG DEMO U.S. Army Sgt. Malkia Litaker and her military working dog, Gerko, work together to find simulated explosives during a demonstration on Fort McNair, Washington, D.C., Jan. 14, 2009. Litaker is assigned to the 947th Military Police Detachment, which provided explosive-detection capability during inaugural events in the nation's capital. Litaker said Gerko can detect up to nine different chemical scents that might indicate the presence of explosives. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 566817-U-YHX11-632.jpg Photo Gallery