Interesting in that the facts were finally ascertained and it must be rewarding to "Tracing Grandad" and those who did the spade work. Where did the references to No 129 Squadron and then No 71 Squadron and Mustangs come from? As an aside, Eagle squadrons, Nos 71, 121,and 133 were disbanded on 29 September 1942 as the USAAF presence in Britain was built up.On the same date these squadrons were absorbed into the 8th Air Force.No 4 Fighter Group as No 334,No 335 and No 336 Squadrons respectively. No 71 Squadron reformed in Germany in 1950 but No 121 and No 133 Squadron numbers appear to be have never been taken up in the RAF structure since. I think a special passport,issued to an embassy diplomatic staff does give the holder protection in that in time of the declaration of war,the staff from the ambassador down are subject to international diplomatic protocols.This is intended to prevent them from being interned but allowed to be safely evacuated and returned to their home country.