U.S. Air Force Senior Airman Samantha Snyder, 633rd Security Forces Squadron military working dog handler and Rendi, 633rd SFS military working dog, practice explosives detection at Joint Base Langley-Eustis, Virginia, Feb. 26, 2019. MWDs are trained for detecting either explosives or narcotics but not both; this way the handler knows what is being detected and how to approach the situation. (U.S Air Force photo by Senior Airman Anthony Nin Leclerec)