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The first major production version was the P-38E, which had a 20mm cannon rather than the earlier 37mm cannon. Production of the E began in September 1941 and 210 were built. The next version, the P-38F, introduced pylon racks that could carry either bombs or droppable fuel tanks, greatly extending its range. Production of the G began in August 1942, followed by the P-38H in May 1943, which had a more powerful version of the Allison V-1710 engine.
The P-38J, introduced in August 1943, was considerably improved over earlier models. It had better cockpit heating (a notable problem on earlier models), more efficient cooling for its engines, a flat bulletproof windscreen, additional fuel in the wings, and increased maneuverability.
When the Lightning began combat operations from England in September 1943, it was the only fighter with the range to escort bombers into Germany.