A tourist train is decorated with Christmas lights in Bogotá, Colombia on December 10, 2017. (Photo by Jaime Saldarriaga/Reuters)

American actress and model Christina Hendricks attends NBC's New York Mid Season Press Junket at Four Seasons Hotel New York on January 24, 2019 in New York City. (Photo by Jamie McCarthy/Getty Images)

Models wait backstage ahead of the Carolina Herrera Fall/Winter 2023 collection show during the New York Fashion Week in New York City, U.S., February 13, 2023. (Photo by Andrew Kelly/Reuters)

A bear that wandered into a University of Colorado Boulder dorm complex falls from a tree after being tranquilized by Colorado wildlife officials on April 26, 2012. Colorado wildlife official Jennifer Churchill said that the 200-pound male bear was tagged and relocated to a remote Rocky Mountain area. The bear was hit by two cars on May 3 and died. (Photo by Andy Duann)

Throughout the course of the long war in Afghanistan, Coalition troops have relied on thousands of military working dogs to help keep them safe, and make their jobs easier. The dogs are trained to detect explosives, to find illegal drugs, to search for missing comrades, or target enemy combatants. Not only are they active on the front lines, but behind the lines they serve as therapy dogs, service dogs, and loyal companions. They also share the same risks as the ground troops, suffering injuries and sometimes death on the battlefields. Gathered here are images of these dogs and their handlers in Afghanistan and back home, from over the past several years, part of the ongoing series here on Afghanistan.

(L-R) Madelaine Petsch, Julia Fox, Kacey Musgraves, Kim Petras and Aquaria attend the Moschino Prefall 2020 Runway Show front row at New York Transit Museum on December 09, 2019 in Brooklyn City. (Photo by Astrid Stawiarz/Getty Images for Moschino)

Arrow sports his new elastic booties at a PetSmart in Tempe, Ariz. on Tuesday, June 20, 2017. Phoenix radio station KSLX handed out the protective coverings to protect dogs' paws from the hot pavement, as temperatures in Phoenix are forecasted to hit 120 degrees (48°C). (Photo by Angie Wang/AP Photo)