Devoted Duo Air Force Staff Sgt. Ross Carpenter, a 436th Security Forces Squadron military working dog handler, greets Karlo before they conduct a patrol shift at Dover Air Force Base, Del., Dec. 28, 2020. SHARE: Download: Full Size (1.47 MB) Tags: air force Credit: Mauricio Campino, Air Force VIRIN: 201228-F-DA916-1010Y.JPG Photo Gallery