The P-38 Lightning introduced a new dimension to American fighters - a second engine. The multi-engine configuration reduced the Lightning loss-rate to anti-aircraft gunfire during ground attack missions. Single-engine airplanes equipped with power plants cooled by pressurized liquid, such as the North American P-51 Mustang, were particularly vulnerable. Even a small nick in one coolant line could cause the engine to seize in a matter of minutes.

The Lightning designed by Lockheed engineer Clarence "Kelly" Johnson and his team of designers, represented one of the most radical departures from tradition in American fighter development. The Lightning was a complete break-away from conventional airframe design, power, and at long last, armament. Not only did it have twice the power and almost twice the size of its predecessors, but with no less than four .50 cal. machine guns plus a 20 mm cannon, the P-38 had enough firepower to sink a ship--and sometimes did. Concentrated in the central fuselage pod, the guns fired parallel which eliminated a need for a propeller synchronizer.

The Lightning tricycle landing gear and twin-boom configuration completed the list of major deviations from what might he considered conventional Army fighters. In this respect, it was very unusual that the Lightning design progressed beyond the testing stage; such radical concepts seldom achieved production status. But the simple fact was that the P-38 design worked and the Army seemed to have found its dream plane in this 400 mph fighter.