Admiral Sir St. John Reginald Joseph Tyrwhitt, 2nd Baronet, (18 April 1905 – 10 October 1961) was a senior Royal Navy officer who served as Second Sea Lord and Chief of Naval Personnel from 1959 to 1961.
Admiral Sir St. John Reginald Joseph Tyrwhitt, 2nd Baronet, (18 April 1905 – 10 October 1961) was a senior Royal Navy officer who served as Second Sea Lord and Chief of Naval Personnel from 1959 to 1961.