This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
CaquotTypeRObservationBalloonUSAFMuseum. Caquot Type Observation Balloon in the Early Years Gallery at the National Museum of the United States Air Force Tethered balloons allowed World War observers to see as far as miles behind enemy lines to spot troop movements chart trench systems and direct artillery fire The observation balloon