By the way there are other Joseph Brooks in the Royal Navy:-
(See f m p )
Joseph Brooks, 220093
Chatham at the top of the large Record Card / Sheet
Born Bethnal Green, London, 21 Nov 1885
Engagement 1903 - 12 yrs
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Joseph Brooks M8281
No place written at top of Card Sheet
Born Atherton, Lancs 8 Jan 1887
Period of engagement 2 August 1914 1yr NCS
18 Oct 15 - 22 Nov 15
Shore NCS Exp_te_ [Expected ?]
https://www.commandoveterans.org/rm-serv_rec_abbreviationsPossibly - Non-CS
Non-continuous service
Today, also
Navy Careers Service
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Joseph Brooks
K22497 Portsmouth
Born Ashby, Leics, 1891
Engagement 12 May 1914 - 12 yrs
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ADDED:
Joseph Brooks
215502 Portsmouth
Born 1885 Loughborough
Aug 1914
Shore Med Unfit
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Joseph Brooks, Former R.N.V.R. [Volunteer Reserve] Y6510
J.61824 Portsmouth
Engagement 10 Nov 1916 - Hostilities
Born Birkenhead, Cheshire 1891
TNA ADM 188/770
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Engagement of these are 1917 and after
Joseph Brooks
F38802
(Felixstowe) (E'church) [possibly Eastchurch?]
Engagement 25 Sept 1917 - Hostilities
Born Sheffield, Yorkshire, 1896
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Joseph Brooks
SS 125606 Portsmouth
Engagement from 1921 - 1921
Born Bethnal Green 1901
PRO / TNA ADM 188/1131
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There may be more records at the Royal Navy Museum Reply # 37