Berliner an early helicopter lands at Bolling fiield in Washington DC, United States. Pilot stands with the helicopter in the background. Men work on the helicopter. Helicopter's engine starts and it takes off. (Note: The Berliner helicopter that first made a controlled flight, in 1924, is in the Smithsonian's National Air and Space Museum collection and displayed at the College Park Aviation Museum in Maryland)
General William Mitchell, in civilian clothes after his court martial, and resignation from the U.S. Army. He takes a walk with his wife and baby in a park in Washington DC, United States.
U.S. President John Calvin Coolidge, Jr. with his family aboard yacht Mayflower in Washington DC, United States. Officials embark on the yacht with the President. President Coolidge with Captain Andrews and Governor Percival Wood Clement of Vermont. They talk and pose. John Coolidge, the son of the President, talks to other officials.
View of the Old Executive Office Building in Washington DC. Library of Congress building. Trolley tracks in the street. Court of Neptune sculptures and fountains at the Library of Congress (101 Independence Ave SE, Washington, DC 20540, USA).
Treasury Building in Washington, DC, viewed from park across Pennsylvania Avenue. Man walks on footpath in park. Closer view of Treasury building with statue of Alexander Hamilton, in front. Monument to fallen soldiers of the U.S. First Division, American Expeditionary Forces (AEF) of World War One. Statue of Winged Victory tops the monument. Smithsonian Museum of Natural History, with several cars parked outside.
War Department Munitions Building in Washington DC, United States. Motorcycles pass in the street. pedestrians on sidewalks and crossing street. Some cars parked at the curb and others drive past. American flag flies from tall flagpole atop the Munitions building (Constitution Gardens Pond, Washington, DC 20004, USA).