Sentry Mission An E-3 Sentry aircraft conducts a North American Aerospace Defense Command mission from Joint Base Elmendorf-Richardson, Alaska, to the high Arctic supported by KC-135 Stratotankers, March 10, 2020. SHARE: Download: Full Size (1.51 MB) Tags: Air Force Credit: Air Force Airman 1st Class Aaron Guerrisky VIRIN: 200310-F-HJ760-1187M.JPG Photo Gallery