Rocky, a patrol narcotics dog with the 226th Military Working Dog Detachment, runs through a set of stairs during an obedience demonstration Jan. 6 at the 226th MWD Detachment, Fort Hood. The certification tests the dog teams’ proficiency in patrol and detection work by having them complete a series of tasks such as an odor recognition test, obedience, response to gun fire, and building and road searches. (U.S. Army photo by Sgt. Samuel Northrup, 7th Mobile Public Affairs Detachment)