Hexagon KH-9 Development Model on display at Dayton, Ohio Air Force Museum

I highly recommend a trip to Dayton, Ohio to visit the Wright Patterson United States Air Force Museum to see their incredible collection of aircraft.

It also contains the Development Model of the Hexagon spy satellite in its entirety on display. 

The museum has one of the world’s largest collections of aircraft and missiles. The collection contains many rare aircraft of historical or technological importance, and various memorabilia and artifacts from the history and development of aviation. Among them is one of four surviving Convair B-36 Peacemakers, the only surviving North American XB-70 Valkyrie and Bockscar—the Boeing B-29 Superfortress that dropped the Fat Man atomic bomb on Nagasaki during the last days of World War II.

In 2010, the museum launched its 360-degree Virtual Tour, allowing most aircraft and exhibits to be viewed online.

Presidential aircraft

The museum has several Presidential aircraft, including those used by Franklin D. Roosevelt, Harry Truman and Dwight D. Eisenhower. The centerpiece of the presidential aircraft collection is SAM 26000, a modified Boeing 707 known as a VC-137C, used regularly by presidents John F. Kennedy, Lyndon B. Johnson and Richard Nixon. This aircraft took President and Mrs. Kennedy to Dallas on 22 November 1963—the day of the President's assassination. Vice President Johnson was sworn in as president aboard it shortly after the assassination, and the aircraft then carried Kennedy's body back to Washington.[10] It became the backup presidential aircraft after Nixon's first term.

The Hexagon vehicle is located in building 4 right next to the Presidential Air Force One planes.