APPENDIX I. Establishment for the Inter-Services Security Board Members:1 G.S.O.I. ... ... War Office 1 Commander ... ... Admiralty 1 Wing Commander ... Air Ministry A representative of M.I.5. who will also represent M.I.6 1 Officer ... ... H.Q. ETOUSA The Chief Security Adviser to the Panel on Security Arrangements in Government Departments. Secretariat:Secretary G.S.O.I. 3 Officers of G.S.O.II grade or, if from R.N. or R.A.F. of equivalent grading. Clerical Staff:1 Junior Civil Assistant 1 1 Shorthand Typist War Office.