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RADAR AND ELECTRONIC WARFARE 1939-1945 (H 28386) Aircraft Navigation and Guidance: MPs visiting No 554 Anti Aircraft Battery near Harwich watching a demonstration of a searchlight with radar equipment known as ELSIE – 90 cm Searchlight Control Radar (SLC) No 2 Mk VI – which entered service in 1942 and was of immense assistance to anti-aircraft when used against the flying bomb attacks of 1944. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205196714