Military career Aminoff began his military career as an officer cadet in the
Life Guards of Horse on 10 October 1915, and enrolled at
Military Academy Karlberg the same year. He graduated from the Military Academy on 19 December 1917 and was commissioned as a
second lieutenant in the Life Guards of Horse on 31 December 1917. He resigned in 1919 with permission to join the regiment's reserve as a second lieutenant on 29 August 1919 and was promoted to
underlöjtnant in the reserve on 31 December 1919. He became a full
lieutenant on 30 November 1922 and was appointed
ryttmästare in 1934. Aminoff served as Marshal of the Diplomatic Corps (
Introduktör av främmande sändebud) from 1970 to 1974 (deputy in 1966) and
Grand Master of the Ceremonies from 1971 to 1977. ==Personal life==