The first terminology for organisers of cargo/walk on freight were Air Quartermasters (AQM) a term that was adopted from the RAF. From memory this was post-WWII up until the introduction of the C130 when the american terminology was adopted.
Further to the above. From the "Source Book of the RAF" The Quatermaster "QM" brevet was introduced to the RAF on 16 May 1962 as; "the qualities required of an air quartermaster and the responsibility attaching to their duties are such as to merit aircrew status." Their brevet was the standard half-wing with the letter QM. I can recall seeing the QM brevet on personnel in my early RNZAF days in the mid 1960's