U.S. Army Spc. Alex Serna, left, and another soldier pet Army Sgt. Coma, a military working dog, after completing a practice exercise on Forward Operating Base Tagab in Kapisa province, Afghanistan, Sept. 6, 2013. Serna, a dog handler, and Coma, a tactical explosive detector dog, are assigned to the 10th Mountain Division's Company A, 2nd Battalion, 4th Infantry Regiment, 4th Brigade Combat Team. U.S. Army Spc. Alex Serna, left, and another soldier pet Army Sgt. Coma, a military working dog, after completing a practice exercise on Forward Operating Base Tagab in Kapisa province, Afghanistan, Sept. 6, 2013. Serna, a dog handler, and Coma, a tactical explosive detector dog, are assigned to the 10th Mountain Division's Company A, 2nd Battalion, 4th Infantry Regiment, 4th Brigade Combat Team. SHARE: Download: Full Size (2.32 MB) Tags: Photo Essays Credit: VIRIN: 264718-A-QPO87-140.jpg Photo Gallery