NELLIS AIR FORCE BASE, Nev. -- Jon A. Minnich, a U.S. Marshals Service explosive detection canine handler, discusses different explosive odor combinations with Lauren Marakas, senior special agent canine handler from the Bureau of Alcohol, Tobacco, Firearms and Explosives, while petting Ruthie, an explosives detection canine, during a joint explosive detection training exercise, Dec. 16. Military working dog handlers from the 99th Security Forces Squadron worked with 25 canine teams from the Las Vegas area. (U.S. Air Force photo/Senior Airman Brett Clashman)