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Queen Elizabeth II and President of the United States, Dwight Eisenhower (front, left) inspect a Guard of Honor, with Commanding Officer Lt Col Robert E Phelps (front, centre), Col R L Schulz (behind, left) and Equerry Patrick Plunket (behind, right), as Her Majesty arrives at the Military Air Transport Service Terminal in Washington DC, October 17th 1957. (Photo by Rolls Press/Popperfoto/Getty Images)

Queen Elizabeth II and President of the United States, Dwight Eisenhower (front, left) inspect a Guard of Honor, with Commanding Officer Lt Col Robert E Phelps (front, centre), Col R L Schulz (behind, left) and Equerry Patrick Plunket (behind, right), as Her Majesty arrives at the Military Air Transport Service Terminal in Washington DC, October 17th 1957. (Photo by Rolls Press/Popperfoto/Getty Images)