|Jeaffreson Herbert Greswell|
|Born||28 July 1916
Epsom, Surrey, England
|Died||19 November 2000 (aged 84)
Chiltern, Buckinghamshire, England
|Service/branch||Royal Air Force|
|Years of service||1935–1968|
|Commands held||OC No. 179 Squadron RAF
OC RAF Kinloss 1957 – 1959
Commandant Royal Observer Corps 1964 - 1969
|Battles/wars||World War II|
|Awards||Distinguished Flying Cross|
As an Air Commodore, Greswell served as the eleventh Commandant Royal Observer Corps between June 1964 and June 1968.
Greswell joined the RAF in 1935 and served for over thirty years. Much of his war time service was spent with Coastal Command operating on convoy protection duties. Initially flying Ansons with No. 217 Squadron RAF and later in Wellingtons, promoted to Squadron Leader with No. 172 Squadron RAF. He was heavily involved in the development and testing of the 'Leigh Light' illumination system used effectively in the war against the U-boat menace. On the first serious test of the system in 1942, a Wellington piloted by Greswell, located two U-boats and seriously damaged both with depth charges and machinegun fire.
On his return from a detachment in the United States, where he had overseen American manufacturers on the fitting of the Leigh Light system in Liberators and trained aircrew in its use, he was promoted to Wing Commander and posted to No. 179 Squadron RAF in Gibraltar.
At the end of the war Greswell was placed on the reserve list of RAF officers. Upon recall in the 1950s he was promoted to Group Captain and his post war appointments included involvement in the air support planning for the British forces landings in Egypt during the Suez crisis in 1956.
Royal Observer Corps
On promotion to Air Commodore rank in June 1964, Greswell was appointed as the 11th Commandant of the ROC during a period which saw the greatest reorganisation and upheaval in the organisation’s history.
Honours and awards
- 28 July 1942 - Squadron Leader Jeaffreson Herbert Greswell (37318), No. 172 Squadron, awarded the Distinguished Flying Cross.
- 28 March 1944 - Wing Commander Jeaffreson Herbert Greswell DFC (37318), Royal Air Force, No. 179 Squadron, awarded the Distinguished Service Order.
- 1 January 1946 - Wing Commander Jeaffreson Herbert Greswell DSO DFC (37318), Reserve of Air Force Officers, appointed as an Officer of the Order of the British Empire 
- 2 June 1962 - Appointed as a Commander of the Order of the British Empire.
- 10 June 1967 - Appointed as a Companion of the Order of the Bath.
- "Air Commodore J H Greswell". Air of Authority - A History of RAF Organisation. Retrieved 7 June 2015.
- "Air Commodore Jeaffreson Greswell". The Telegraph. 4 December 2000. Retrieved 7 June 2015.
- "No. 35646". The London Gazette (Supplement). 28 July 1942. p. 3303.
- "No. 36443". The London Gazette (Supplement). 28 March 1944. p. 1444.
- "No. 37407". The London Gazette (Supplement). 1 January 1946. p. 35.
- "No. 42683". The London Gazette (Supplement). 2 June 1962. p. 4315.
- "No. 44326". The London Gazette (Supplement). 10 June 1967. p. 6271.
- Air of Authority - A History of RAF Organisation - Air Commodore J H Greswell
- Telegraph obituaries - Air Commodore Jeaffreson Greswell
C M Wight-Boycott
|Commandant Royal Observer Corps
1964 – 1968
D F Rixson