He was commissioned an acting sub-lieutenant on 1 May 1928 .
He was successively promoted to sub-lieutenant ( 1 January 1929 ) , lieutenant ( 1 October 1930 ) and to lieutenant - commander ( 1 October 1938 ) .
He was commissioned an acting sub-lieutenant on 1 May 1928 , and successively promoted to sub-lieutenant ( 1 January 1929 ) , lieutenant ( 1 October 1930 ) and to lieutenant - commander ( 1 October 1938 ) .