Guard Photo Alaska National Guard members of the 49th Missile Defense Battalion operate the ground-based midcourse defense portion of the Ballistic Missile Defense System at Fort Greely, Alaska, May 4, 2007. SHARE: Download: Full Size (1.91 MB) Credit: Army Sgt. Jack W. Carlson III, Alaska Army National Guard VIRIN: 070504-A-DH716-082M.JPG Photo Gallery