New Year's Eve revellers from Asia with Australian flags and balloons in the shape of the new year 2020 in Sydney, Australia on December 31, 2019. (Photo by Richard Milnes/Rex Features/Shutterstock)

(L-R) Sophie Turner, Priyanka Chopra Jonas, and Danielle Jonas during the 62nd Annual GRAMMY Awards at STAPLES Center on January 26, 2020 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for The Recording Academy)

A young boy plugs his ears as his sister (C) and nanny (L) watch from Gravelly Point Park as planes land at Reagan National Airport in Arlington, Virginia on June 29, 2017. President Donald Trump' s travel ban on people from six mostly Muslim countries will come into force late Thursday, as controversy swirls over who qualifies for an exemption based on family ties. (Photo by Jim Watson/AFP Photo)

Hannah Prock, of Austria, prepares to start the luge women's singles run 1 at the 2022 Winter Olympics, Monday, February 7, 2022, in the Yanqing district of Beijing. (Photo by Thomas Peter/Reuters)

American singer Ashley Nicolette Frangipane, known professionally as Halsey shows off her Innovation Award in early March 2022. (Photo by iamhalsey/Instagram)

Director Pawel Pawlikowski holds his Oscar for best foreign language film for “Ida”, with presenters Chiwetel Ejiofor (L) and Nicole Kidman during the 87th Academy Awards in Hollywood, California February 22, 2015. (Photo by Lucy Nicholson/Reuters)

A model presents a creation by German designer Karl Lagerfeld as part of his Haute Couture Fall Winter 2015/2016 fashion show for French fashion house Chanel at the Grand Palais which is transformed into a casino in Paris, France, July 7, 2015. (Photo by Stephane Mahe/Reuters)

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.