The C-45 was the World War II military version of the popular Beechcraft Model 18 commercial light transport. Beech built a total of 4,526 of these aircraft for the Army Air Forces between 1939 and 1945 in four versions, the AT-7 Navigator navigation trainer, the AT-11 Kansan bombing-gunnery trainer, the C-45 Expeditor utility transport and the F-2 for aerial photography and mapping. The AT-7 and AT-11 versions were well-known to WWII navigators and bombardiers, for most of these men received their training in these aircraft. Thousands of AAF pilot cadets also were given advanced training in twinengine Beech airplanes.
During the early 1950s, Beech completely rebuilt 900 C-45s for the Air Force. They received new serial numbers and were designated C-45Gs and C-45Hs, remaining in service until 1963 for administrative and light cargo duties