Note that bombardiers that used the top secret SHORAN also received the Observer Badge. In summer 1940, Seeley proposed building SHORAN for the Army Air Force. Gee-H was adapted by RCA into the US wartime SHORAN system with improved accuracy. Little new top-of-the-line technology was used in Korea, but SHORAN was an exception. SHORAN was later used for off-shore oil exploration and for aerial surveying. SHORAN used ground-based transponders to respond to interrogation signals sent from the bomber aircraft.