“Shortly after he arrived, Van Agtmael witnessed the aftermath of this suicide bombing at a cafe that soldiers frequented in Mosul. Nine people died and 23 were wounded”. (Photo and caption by Van Agtmael/Harrison Jacobs/Magnum Photos)

Two three-month-old female white Bengal tiger cubs play with a zoo keeper in their enclosure at the Buenos Aires' Zoo, in Argentina, on April 17, 2014. Captive white Bengal tiger Cloe, gave birth to three cubs – two females and one male – on January 14, 2014. (Photo by Juan Mabromata/AFP Photo)

A Chinese future bride has her friends playing with her dress during a pre-wedding photoshoot in front of the Eiffel tower in Paris, France, August 28, 2015. As young Chinese become wealthier, they take abroad the tradition of taking their wedding photos days before they are married, rather than on their wedding day. (Photo by Philippe Wojazer/Reuters)

Indian children work nearby to their parents at a construction project in front of the Jawaharlal Nehru Stadium on January 30, 2010 in New Delhi, India. The children accompany their parents to the work site, where if they are prepared to work, they will receive money for bread an milk and be provided with dinner by the contractor. The sheer scale of the project has drawn an enormous population of migrant workers from all over India.

A Sotheby's employee holds a rare 52.82-carat white diamond ring at Sotheby's auction house on April 12, 2010 in London, England. Price: 7 million USD. (Photo by Dan Kitwood/Getty Images)

The original costumes for Star Wars character Darth Vader stand on display at “Star Wars: The Exhibition” at County hall on May 04, 2007 in London, England. (Photo by MJ Kim/Getty Images)

“Amy Jade Winehouse (14 September 1983 – 23 July 2011) was a British singer-songwriter known for her powerful contralto vocals and her eclectic mix of musical genres including R&B, soul and jazz. ... Winehouse died at the age of 27 on 23 July 2011 at her home in London; police have said that the cause of her death was «as yet unexplained»”. – Wikipedia

Photo: Amy Winehouse vigil outside Amy Winehouse's North London home on July 23, 2011 in London, England. Singer Winehouse, 27, was found dead today. (Photo by Sylvia Linares/Getty Images)

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.