The US Air Force bought two Bell 47 Ranger helicopters for Presidential use. On July 12, 1957, Dwight D. Eisenhower became the first President to use a helicopter while in office. They were standard Rangers except for the blue tinted bubble for sun protection, military radios and a rotor brake for quicker shutdowns. Both machines are on display, this one in Dayton and 57-2729 at the Steven F. Udvar-Hazy Center in Washington.