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xx Apr 1938	Deputy Directorate of Operational Requirements established under CAS
xx Apr 1938	Gp Capt R H M S Saundby MC, DFC, AFC (wef 18 Jan 1938)
xx Feb 1939	Upgraded to Directorate
xx Jan 1940	Transferred to ACAS (Operational Requirements and Tactics)
5 May 1940	A/Cdre R B Mansell OBE
26 May 1941	A/Cdre J D Breakey DFC
20 Apr 1943	A/Cdre A R Wardle AFC
xx Sep 1945	Renamed Directorate of Operational Requirements (I)
xx xxx 1946	Renamed Directorate of Operational Requirements (A)
12 Oct 1946	A/Cdre T G Pike CB, CBE, DFC
xx Dec 1948	Absorbed into Directorate of Operational Requirements
xx Dec 1948	A/Cdre G W Tuttle CB, OBE, DFC
16 Jan 1950	A/Cdre H V Satterly CB, CBE, DFC
xx Apr 1950	Split into Directorates of Operational Requirements (A) and (B) (see below for (B))
30 Jun 1952	A/Cdre W H Kyle CB, CBE, DSO, DFC, ADC
20 Nov 1954	A/Cdre H J Kirkpatrick CBE, DFC
18 Jan 1957	A/Cdre J F Roulston CBE, DSO, DFC
13 Jan 1958	A/Cdre C M Wight-Boycott CBE, DSO*
11 Aug 1958	A/Cdre T W Piper CBE, AFC
11 Apr 1960	A/Cdre I G Esplin OBE, DFC, MA, BEc
1 Jan 1963	A/Cdre E James DFC, AFC*
xx Sep 1964	Renamed Directorate of Operational Requirements (1) (RAF)
4 Feb 1966	A/Cdre D Crowley-Milling CBE, DSO, DFC*
7 Aug 1967	A/Cdre C W Coulthard AFC*
8 Jan 1970	A/Cdre D C H Simmons CBE, AFC, MA
22 Nov 1971	A/Cdre A D Dick CBE, AFC, MA
28 Aug 1974	A/Cdre D Harcourt-Smith DFC
xx Sep 1976	Renamed Directorate of Aircraft Requirements (RAF) (DOR 1 (RAF))
16 Apr 1977	A/Cdre H A Merriman CBE, AFC*, MRAeS
8 Nov 1980	A/Cdre R C F Peirse
16 Jan 1982	A/Cdre J A Bell OBE
24 Dec 1983	A/Cdre W J Wratten CBE, AFC
31 Mar 1984	Renamed Directorate of Operational Requirements (Air) 1 and transferred to DCDS (Systems)
xx Sep 1986	A/Cdre J Morris CBE, BSc
xx xxx 1988	A/Cdre P C Norriss AFC, MA
xx xxx 1991	A/Cdre A J M McKeon CBE, AFC
xx xxx 1993	Absorbed into Directorate of Operational Requirements (Air)
xx xxx 1993	A/Cdre E W Tyack MRAeS
xx xxx 1995	A/Cdre M C Rudd AFC
xx Nov 1996	A/Cdre A A Nicholson
24 Aug 1998	A/Cdre G A Miller
1 Oct 1999	Post renamed Director Equipment Capability (Theatre Airspace) under DCDS (Equipment Capability)

Directorate of Air Defence Systems and Weapons Requirements (RAF) (DOR 2 (RAF)

20 Mar 1950	Established from part of Directorate of Operational Requirements
20 Mar 1950	A/Cdre H D Spreckley OBE
10 Sep 1952	A/Cdre D R Evans CBE, DFC
19 Dec 1955	A/Cdre C Scragg CBE, AFC*
12 Dec 1958	A/Cdre R N Bateson DSO*, DFC, ADC
21 Sep 1959	A/Cdre A A Case CBE
28 Oct 1961	A/Cdre P C Fletcher OBE, DFC, AFC
7 Jan 1964	A/Cdre R G Knott DSO, DFC, AFC*
xx xxx 1964	Renamed Directorate of Operational Requirements (2) (RAF)
27 Mar 1967	A/Cdre D C Lowe DFC, AFC
3 Nov 1969	A/Cdre I S Stockwell CBE, DFC, AFC
24 Jul 1972	A/Cdre A G Steele CBE, AFC*
3 May 1975	A/Cdre J G G Beddoes
xx xxx 1976	Renamed Directorate of Systems and Weapons Requirements (RAF) (DOR 2 (RAF)
16 Sep 1978	A/Cdre M K Adams AFC, FRAeS
5 Dec 1981	A/Cdre D W Hann
xx xxx 1983	Renamed Directorate of Air Defence Systems and Weapons Requirements (RAF) (DOR 2 (RAF)
31 Mar 1984	Renamed Directorate of Operational Requirements (Air) 2 and transferred to DCDS (Systems)
31 Mar 1984	A/Cdre R M Austin
xx Jan 1986	A/Cdre G C Williams
xx Dec 1986	A/Cdre the Hon T C Elworthy CBE
xx Sep 1988	A/Cdre F W Mitchell
xx xxx 1990	A/Cdre M J Bettell
xx xxx 1992	A/Cdre E W Tyack MRAeS
xx xxx 1993	Absorbed into Directorate of Operational Requirements (Air)

22 Jul 1955	Directorate established
22 Jul 1955	A/Cdre W R Brotherhood CBE
29 Dec 1958	A/Cdre D C McKinley CBE, DFC, AFC*
1 Jan 1962	A/Cdre J A Leathart CB, DSO
6 Oct 1962	A/Cdre A D Frank CBE, DSO, DFC, BA
xx xxx 1964	Renamed Directorate of Operational Requirements (3) (RAF)
2 Apr 1965	A/Cdre J C T Downey DFC, AFC
4 Jan 1968	A/Cdre M J Beetham CBE, DFC, AFC
21 Oct 1968	A/Cdre J W Allan DSO, DFC, AFC
26 May 1971	A/Cdre J R Rogers CBE
8 Dec 1973	A/Cdre P E Bairsto CBE, AFC, MBIM
xx Sep 1976	Directorate abolished

1 Nov 1940	Post established under ACAS (Operational Requirements and Tactics)
1 Nov 1940	Gp Capt F C V Laws CBE
xx Jun 1942	Transferred to ACAS (Technical)
xx Sep 1942	Transferred to ACAS (Technical Requirements)
xx xxx 1946	Transferred to ACAS (Operations)
xx xxx 1946	Gp Capt M B Edwards
xx xxx 1946	Post abolished

7 Dec 1943	Established from part of Directorate of Operational Requirements
7 Dec 1943	A/Cdre H L Patch CBE
xx Sep 1945	Renamed Directorate of Operational Requirements (II)
xx Feb 1946	A/Cdre C P Brown CBE, DFC
xx xxx 1946	Renamed Directorate of Operational Requirements (E)
29 Dec 1947	A/Cdre G W Tuttle CB, OBE, DFC
xx Dec 1948	Absorbed into Directorate of Operational Requirements

5 Feb 1945	Post established under ACAS (Technical Requirements)
5 Feb 1945	AVM G Combe
xx xxx 1946	Transferred to CAS
14 Oct 1947	AVM G A H Pidcock CB, CBE
xx xxx 1948	Transferred to ACAS (Training)/AMTS
xx xxx 1950	Renamed Directorate-General of Technical Services (I)

25 Aug 1947	Post established under ACAS (Training)
25 Aug 1947	A/Cdre G R Beamish CB, CBE
2 Dec 1948	A/Cdre C M Heard CB
xx xxx 1949	Transferred to ACAS (Technical Requirements)
29 Jan 1951	A/Cdre S O Bufton CB, DFC
xx Sep 1952	Post abolished