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In April 1937 Walker became the Experimental Commander at HMS Osprey. In December 1933 Walker, took command of the Shoreham-class sloop Falmouth based on the China Station. In May 1933 he was promoted to commander and took charge of the World War I destroyer Shikari. Walker consequently became an expert in this particular type of warfare, and was appointed to a post specialising in this field, serving on a number of capital ships. He took a course at the newly founded antisubmarine warfare training school of HMS Osprey, on the Isle of Portland, which was established in 1924. Interwar Period, 1920s–1930s ĭuring the interwar period Walker partook in the field of antisubmarine warfare. He married Jessica Eileen Ryder Stobart, with whom he had three sons and a daughter. Following the end of the First World War, Walker joined the Queen Elizabeth-class battleship Valiant. First serving on the battleship Ajax as a midshipman, Walker as a sub-lieutenant went on to join the destroyers Mermaid and Sarpedon in 19 respectively. He joined the Royal Navy as a cadet in 1909 and was educated at the Royal Naval Colleges at Osborne and Dartmouth, where he excelled. Walker was born in Plymouth, the son of Frederic Murray and Lucy Selina (née Scriven) Walker. Walker was the most successful anti-submarine warfare commander during the Battle of the Atlantic and was known more popularly as Johnnie Walker (for the Johnnie Walker brand of whisky). Captain Frederic John Walker, CB ,DSO & Three Bars (3 June 1896 – 9 July 1944) (his first name is given as Frederick in the Oxford Dictionary of National Biography and some London Gazette entries) was a Royal Navy officer noted for his exploits during World War II.