Ed Drew is a photographer, fine arts student, and staff sergeant in the California Air National Guard. He was deployed to Afghanistan for three months in 2013 and decided to commemorate the time by taking photos of his fellow service members using tintype, a Civil War-era technique. The resulting photos are emotional and gritty. President Barack Obama recently announced plans to pull all troops from Afghanistan by 2016. All photos are copyright Ed Drew courtesy of Robert Koch Gallery, San Francisco.