Ringo, a 3-year-old black Labrador, is used as an off-leash bomb sniffer. He is a veteran of the war in Afghanistan. But the U.S. military now relies more on electronic sensors to do the job. (Associated Press)

Ringo, a 3-year-old black Labrador, is used as an off-leash bomb sniffer. He is a veteran of the war in Afghanistan. But the U.S. military now relies more on electronic sensors to do the job. (Associated Press)