Army Command Sgt. Maj. John Wayne Troxell, senior enlisted advisor to the chairman of the Joint Chiefs of Staff, speaks with a Defense Department K-9 handler at the Pharr, Texas, port of entry, Aug. 14, 2018. DoD dogs along the U.S.-Mexico border are trained to alert on hidden drugs that cartels attempt to sneak across the Southwest border into the United States. DoD photo by Army Master Sgt. Rob Couture