While we are talking about old ranks, how many of you knew we used to have sergeant majors in the RAF? From 1919 we had the ranks of sergeant major 1st class and 2nd class which were renamed warrant officer 1st and 2nd class in 1933. I once owned an RAF LS&GC (George V issue) which was named 'SM2 J.Bloggs, R.A.F." The rank of WO2 was abolished in 1939, but of course it remains in the army.