single passenger in a lying-down position, or cargo. This was a very uncomfortable way to fly. Some of the pods were not even fitted with a window to let the passenger see out or bring in light. Lockheed proposed a carrier-based Model 822 version of the Lightning for the United States Navy. The Model 822 would have featured folding wings, an arresting hook, and stronger undercarriage for carrier operations. The navy was not interested, as they regarded the Lightning as too big for carrier operations and did not like liquid-cooled engines, anyway, and the Model 822 never went beyond the paper stage. However, the navy did operate four land-based F-5Bs in North Africa, inherited from the USAAF and redesignated FO-1. A P-38J was used in experiments with an unusual scheme for midair refueling, in which the fighter snagged a drop tank trailed on a cable from a bomber. The USAAF managed to make this work, but decided it was not practical. A P-38J was also fitted with experimental retractable snow-ski landing gear, but this idea never reached operational service, either. After the war, a P-38L was experimentally fitted with armament of three .60 in (15.2 mm) machine guns. The .60 in (15.2 mm) caliber cartridge had been developed early in the war for an infantry anti-tank rifle, a type of weapon developed by a number of nations in the 1930s when tanks were lighter, but by 1942, armor was too tough for this caliber. Another P-38L was modified after the war as a "super strafer", with eight .50 in (12.7 mm) machine guns in the nose and a pod under each wing with two .50 in (12.7 mm) guns, for a total of 12 machine guns. Nothing came of this conversion, either. Variants XP-38: United States Army Air Force designation for one prototype Lockheed Model 22 first flown in 1939 YP-38: Redesigned preproduction batch with armament, 13 built P-38: First production variant with 0.5 in guns and a 37 mm cannon, 30 built XP-38A: Thirtieth P-38 modified with a pressurised cockpit Lightning I: Former Armée de l'air order for 667 aircraft (being reduced to 143 Lighting Is), it was taken by the Royal Air Force, three delivered to RAF, and the remainder of the order was delivered to USAAF. It used C-series V-1710-33 engines without turbochargers, and right-hand propeller rotation (not counter). Lightning II: The Royal Air Force designation for