Randy Bader, a museum visitor from Minnesota, signs the Korean Veterans Association Chapter 160 Guest Book June 25, 2011 at the South Dakota Air and Space Museum. Mr. Bader brought his family to learn some history and meet with Korean War veterans, who were there to educate the public and commemorate the 61st anniversary of the start of the Korean War. (U.S. Air Force photo/Tech. Sgt. Nathan Gallahan/released)