In one of the world's most sophisticated early photo reconnaissasnce programs, "photo interpreters" based in Medmenham, England poured over thousands of images collected daily by Allied reconnaissance aircraft for wartime intelligence. Most famously, the Medmenham base was crucial in the identification and eventual bombing of Nazi Germany's secret V-1 and V-2 rocket development sites. As flying bombs began to fall on London, "Operation Crossbow" commenced with urgency, charged with stopping Werner von Braun's wartime rocketry program. In a situation that would increasingly repeat itself during the Cuban missile crisis, the leadup to the invasion of Iraq, and countless other modern military operations, photo interpreters learned to spot the telltale ski-shape V-1 launch ramps, eventually tracing them back to a secret base in Peenemünde. Many of the planes were equipped to capture stereoscopic imagery which, when viewed with parallax glasses, gave the landscape a 3-D effect to make spotting vertical launch towers easier.