Warren M. Bodie, journalist, historian, and Skunk Works engineer from 1977 to 1984, wrote that engineering independence, elitism and secrecy of the Skunk Works variety were demonstrated earlier when Lockheed was asked by Lieutenant Benjamin S. Kelsey (later air force brigadier general) to build for the United States Army Air Corps a high speed, high altitude fighter to compete with German aircraft. In July 1938, while the rest of Lockheed was busy tooling up to build Hudson reconnaissance bombers to fill a British contract, a small group of engineers was assigned to fabricate the first prototype of what would become the P-38 Lightning. Kelly Johnson set them apart from the rest of the factory in a walled-off section of one building, off limits to all but those involved directly. Secretly, a number of advanced features were being incorporated into the new fighter including a significant structural revolution in which the aluminum skin of the aircraft was joggled, fitted and flush-riveted, a design innovation not called for in the army's specification but one that would yield less aerodynamic drag and give greater strength with lower mass. As a result, the XP-38 was the first 400 mph fighter in the world. The Lightning team was temporarily moved to the 3G Distillery, a smelly former bourbon works where the first YP-38 (constructor's number 2202) was built. In November 1941, Kelsey gave the unofficial nod to Johnson and the P-38 team to engineer a drop tank system to extend range for the fighter, and they completed the initial research and development without a contract. When the Army Air Forces officially asked for a range extension solution it was ready. The range modifications were performed in Lockheed's Building 304, starting with 100 P-38F models on April 15, 1942. Some of the group of independent-minded engineers were later involved with the XP-80 project, the prototype of the P-80 Shooting Star.