A highly decorated World War II officer, Schaper was awarded the Military Order of William, the highest honour of the Netherlands on 15 November 1940.

He was the Commander of the Royal Netherlands Air Force from 1 May 1956 until 1 September 1961 and the Chairman of the United Defence Staff of the Armed Forces of the Netherlands (highest-ranking military officer) from 1 November 1957 until 10 May 1959.

He retired from active service in 1961 and served as State Secretary for Defence, tasked with Air Force affairs from 22 June 1966 until 5 April 1967.

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