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On the sign:
MARSHAL OF THE ROYAL AIR FORCE THE VISCOUNT PORTAL OF HUNGERFORD K.G. G.C.B. O.M. D.SO. M.C.. 1893 1971. CHIEF OF THE AIR STAFF, 1940-1945. ONE OF THE ARCHITECTS OF VICTORY IN THE SECOND WORLD WAR.
The list of titles appearing on the sign K.G. - Knight of the Order of the Garter G.C.B. - Knight Grand Cross of the Order of the Bath O.M. - Member of the Order of Merit D.SO. - Distinguished Service Order & Bar Military Cross M.C. - Mentioned in Despatches