Boeing XB-38 Flying Fortress Boeing XB-38 Flying Fortress The XB-38 Flying Fortress was a single example conversion of a production B-17E Flying Fortress, testing whether the Allison V-1710 V type engine could be substituted for the standard Wright R-1820 radial engine during early World War II. The XB-38 was the result of a modification project undertaken by Boeing and Vega (a subsidiary of Lockheed) on a B-17 Flying Fortress to fit it with liquid-cooled Allison V-1710-89 Vee engine. It was meant as an improved version of the B-17, and a variant that could be used if air-cooled Wright R-1820 radial engines became scarce. Completing
Military history of the United States during World War II Empire and Chinese forces in Burma and suffered many casualties. On 10 August 1944 the Marauders were consolidated into the 475th Infantry. The U.S. also had an adviser to Chiang Kai-shek and Joseph Stillwell. Units of the Tenth Air Force, Fourteenth Air Force, and Twentieth Air Force of the USAAF also served in the theatre, including the previously mentioned "Flying Tigers". Military history of the United States during World War II The military history of the United States in World War II covers the war against Germany, Italy, and Japan, starting with the 7 December 1941 attack on Pearl Harbor.