We are 'scribblers' from Australia. In terms of personal history, Arthur spent just over 20 years in the Australian Army Infantry Corps from 1963 to 1984 (serving 2 tours in Vietnam). Mark spent 5 years in the Australian Army Medical Corps from 1984 to 1989 (serving with Reserve/Regular/Integrated Units). We both put together very small military insignia collections, based on service background (Arthur: in Vietnam campaign areas of interest and Mark: on Commonwealth Army Medical Corps insignia and ultimately Medical Corps from all armies). So, we are ordinary everyday militaria collectors who decided to write a series of guide books for other collectors, based on our personal familiarity with the Australian Army's customs of service.