Clem enlisted in January 1942 he did his elementary flying training at Temora and was posted to Canada for service flying training in Manitoba on Harvards. Posted to England for advanced flying at a Hurricane OUT. He volunteered for service with 1435 Squadron RAF based in Brindisi in Italy. His story is about almost losing his life due to oxygen starvation flying a Spitfire at high altitude. He was flying at 35,000’ to intercept Me109s when his oxygen valve froze. His Spitfire went into an inverted spin, reaching a speed of well over 600mph. He tells of what happened when he regained consciousness at 15,000’.