"There are at present four types of transport airplanes and two types of gliders in our service which are suitable for transport of field artillery units."
"The pamphel presents a course in Radio Operating Procedure (Voice) in general and as applied to procedure with SCR 194 specifically. The principles of voice procedures are the same for all radio sets employing voice communications."
"This 1941 manual sets forth the nature, types, and purposes of aerial photography with its application to military requirements. The Air Corps functions with respect to aerial photography and the factors affecting the execution of these function...