Best Friends Joe, a military working dog, sits next to his handler during a break in training at Hill Air Force Base, Utah, March 4, 2020. Joe is trained as an explosive detection dog. SHARE IMAGE: Download Image: Full Size (2.42 MB) Tags: Air Force, Dogs Photo By: Cynthia Griggs, Air Force VIRIN: 200304-F-EF974-1210C.JPG Photo Gallery