Dave, I read your article on the use of the word “Roger” in radio communications. As a Ham Radio operator my comment is as follows:
Although, according to OED II, the verbal use of “Roger” to indicate a correctly understood message may date to WWII, the use of the letter “R” to indicate the reception of a correct transmission dates back to the 19th century. Telegraphers and later, CW radio operators, used (and still do) “R” to mean: “Received as transmitted”. Since the old phonetic alphabet was Roger for the letter “R”, it is not too much of a stretch to believe that the word “Roger” was used in early voice transmissions, where the reception of a complete communications was iffy, at best. More research needs to be done into Amateur Radio history to verify this, however. I will see if I can find some early records of voice transmissions.
Edited for clarity.