RAF Flixton was there long before the Museum but the Norfolk & Suffolk Aviation Museum is one of the most fantastic museums I have visited, I have been here many times and have never been disappointed.
But going back to the RAF/USAAF base there are many tales to be told here I know but those can be kept for later, meanwhile down Memory Lane
Re the above 53 MU sign I found this on Wikipedia quote/unquote
Royal Navy/Royal Air Force use
After the war, the field was turned over to the Royal Navy and the station became HMS Europa, being the satellite of HMS Sparrowhawk (RNAS Hatston) where 3 Fleet Air Arm squadrons were based.
In 1946 it was returned to RAF control and was assigned to No. 53 Maintenance Unit and became a maintenance sub-unit of 94 MU which had its HQ at RAF Great Ashfield. Stored on the runways and in the buildings, were 250 lb., 500 lb., 2000 lb., and 4000 lb. bombs, balloon cable cutting cartridges, depth charges, 7" parachute flares and German ammunition. The latter two items were eventually taken to 53 MU at RAF Pulham, and destroyed there. Some time in July 1949, the site was taken over by 53 MU until Bungay's closure in 1955. The airfield was eventually put up for sale and disposed of in 1961/1962.