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Which 1945 meeting did Franklin D. Roosevelt reach aboard the Sacred Cow?

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Mount Rushmore and Air Force One — Air Force One Air Force One, a Boeing 747 reserved for use by the president of the United States, flying over Mount Rushmore, South Dakota.

President Franklin D. Roosevelt traveled aboard the Sacred Cow—a specially modified Douglas C-54 Skymaster—to attend the Yalta Conference in February 1945.1

This meeting, held in Soviet Crimea, brought together Roosevelt, British Prime Minister Winston Churchill, and Soviet Premier Joseph Stalin to coordinate the final defeat of Nazi Germany and discuss the postwar organization of Europe. The aircraft was uniquely equipped for the president's needs, featuring an elevator to assist the wheelchair-bound Roosevelt between the plane and the ground.12