BUMPER CROP Doc, a dog trained to detect improvised explosive devices, retrieves a bumper during a training session on Camp Leatherneck, Afghanistan, March 19, 2013. Dog handlers specializing is detecting explosive devices work with dogs to clear routes and other duties in a combat environment. Doc is assigned to the 2nd Combat Engineer Battalion. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 070270-Q-SMW37-580.jpg Photo Gallery