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In page Lockheed P-38 Lightning:

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The first P-38E rolled out of the factory in October 1941 as the Battle of Moscow filled the news wires of the world. Because of the versatility, redundant engines, and especially high-speed and high-altitude characteristics of the aircraft, as with later variants, over a hundred P-38Es were completed in the factory or converted in the field to a photoreconnaissance variant, the F-4, in which the guns were replaced by four cameras. Most of these early reconnaissance Lightnings were retained stateside for training, but the F-4 was the first Lightning to be used in action in April 1942.[citation needed]