https://youtu.be/IFNsLlm2Ixc

“The subject of aircraft and naval vessel recognition slowly gained acceptance in recognition of its combat importance.”

“Early teaching of planes and ships was largely ineffectual because too much was attempted with too little time and equipment, but by 1943 the pre-flight recognition program was fairly satisfactory. The time allotted to the course was extended, and the number of visual aids greatly increased. During 1994 and 1945, with an adequate supply of projectors, slides, and screens, the schools were quite successful in training students to recognize, almost instantly, close-up views of the principal American and British aircraft. The scope of naval vessel recognition was gradually restricted to identification of ships by general type, including merchantmen and landing craft, rather than by nationality or individual class.” (From The Army Air Forces in World War II, VI. Men and Planes))