A photo of the flag is shown in the book entitled Badges on Battledress by Howard N. Cole (Aldershot, Gale & Polden, 1953). The original caption states: 'NCOs of the Corps of Royal Military Police displaying the Western Union Standard which incorporates the badge of the Headquarters, Western Europe Commanders-in-Chief'. It doesn't say where the photo is taken, although it might just be Fontainebleau.