After a stay in hospital, Calvert returned to base and was awarded a Bar to his DFC. The citation read:  At the end of his first tour, Calvert instructed for a year, but returned to flying operations in January 1944 with No. 630 Squadron based at East Kirkby, Lincolnshire. By August 1944 Calvert he had been promoted to acting squadron leader and was also acting commanding officer of the squadron for about two months. He was awarded a second Bar to his DFC on 15 September 1944, for service while flying with that squadron. His citation read:  Calvert returned to New Zealand in late 1944 after he accepted the opportunity to join a group of New Zealanders about to return home through North America. He was discharged on 15 March 1945, returned to Cambridge and became a farmer for the rest of his working life. Calvert died on 26 March 2002, aged 88, after a battle with cancer. He was buried at the RSA Cemetery at Hautapu, Cambridge having lived in the town and district for all his pre and postwar life.