Once in Britain, Adam's trajectory swung from artistic promise to frontline peril. As a German national he might easily have been interned, but in October 1940 he joined the Pioneer Corps, then won a place in the Royal Air Force Volunteer Reserve. After training in Britain, Canada and the United States — where one of his instructors was actor Michael Rennie — he was posted to No. 609 Squadron at RAF Lympne on 1 October 1943. Flying the robust Hawker Typhoon in support of USAAF bombing raids and later ground-attack missions, Adam earned the grin‑and‑grit nickname “Heinie the tank‑buster.” The danger was not only from the flak and desertion of combat: because he and his brother Denis were German-born, capture by the Wehrmacht could have meant summary execution as traitors rather than treatment as POWs. After the fighting he served as the Allied officer overseeing labour rebuilding at Wunstorf Air Base, was demobilised in 1947 and became a naturalised British subject on 27 December 1946 — a survival arc that feeds directly into the stark modernist imagination he later brought to film sets like Dr. Strangelove and Goldfinger.
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