A P-51 Mustang (WD-U, 42-106438) of the 335th Fighter Squadron, 4th Fighter Group, flown by Lieutenant Curtis Simpson, after a forced landing in Switzerland, 19 July 1944. "P.51B Mustang , coded WD-U, right side three-quarter view, with mountainous background, which I said was in neutral country. It was, in fact, Switzerland, when Lt. Curtis Simpson was forced to abort a mission to Munich on 19th July, 1944, following a glycol leak." Information from Debden historian Keith Braybrooke The fighter was subsequently dismantled by Swiss air force mechanics and transported to Dubendorf, where its engine was repaired. Repainted in Swiss colours, the Mustang returned to the skies on 1 August 1944.