The Rebecca-Eureka system, while an excellent way of guiding transport planes to paratrooper drop zones depended on the pathfinder forces with the Eureka beacons to be in the right place at the right time. During the invasion of Normandy, weather delays prevented this. The inability to have the Eureka teams in place is a significant reason why the paratroop landings in the hours before daylight went so wrong.
Image Number: NASM2013-01490
Credit: National Air and Space Museum, Smithsonian Institution
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