[1] In World War I, Becker enlisted in the Imperial German Army, with tours in Verdun, France, and Ypres, Belgium.
While not officially registered as a doctor in Australia, Becker continued to practise till 1939, earning the ire of the local British Medical Association authorities.
Becker emerged victorious in two libel cases against the association and was supported by both his patients and Sir Richard Layton Butler.
Nonetheless, his numerous requests to return to Australia were rejected, and his marriage was annulled by the South Australian Supreme Court in 1953.
[1] Becker married Mona Gertrude Price on 22 August 1932 at the Adelaide-based St Stephan's Lutheran Church; they had a son and a daughter.