The First Trenchard Memorial Lecture, “Lord Trenchard,” was given by Marshal of the Royal Air Force Sir Dermot Boyle, G.C.B., K.C.V.O., K.B.E., A.F.C., Chief of the Air Staff, at the R.A.F. Station, Halton, on 20th February 1958. This was the 30th main lecture of the Society to be given at a Branch and was held under the auspices of the Halton Branch. The large and distinguished audience included The Dowager Viscountess Trenchard and the present Lord and Lady Trenchard, Sir John Nott-Bower, Commissioner, Metropolitan Police, the Mayor of Aylesbury, a number of members of Council of the Society, the Commanders-in-Chief of Fighter Command, Technical Training Command, Maintenance Command and Home Command of the Royal Air Force, the A.O.C.s of No. 24 and No. 41 Group, the Commandants of Andover, Bracknell, Cranwell and Halton, and many other serving officers of the Royal Air Force.