This 1942 U.S. Navy Training School recognition card taught trainees to identify the R5D/C-54A Skymaster, a four-engine long-range transport used jointly by the U.S. Navy and Army Air Forces. Derived from the civilian DC-4 airliner, the Skymaster played a vital role ferrying personnel and cargo across the vast distances of the WWII Pacific and Atlantic theaters. Project: 218069