Birchwood is a housing estate in the south of Lincoln, Lincolnshire, England.
 The population of the Birchwood Ward of Lincoln City Council at the 2011 census was 8,520.
 It is built on the site of former RAF Skellingthorpe.
Royal Air Force Skellingthorpe or more simply RAF Skellingthorpe is a former Royal Air Force station which was operational during the Second World War.
 It was located in the city of Lincoln, England.
 It was known as "Skelly" by the RAF personnel serving there.
Ernest Russell Lyon (19 December 1922 – 27 July 1944) was a Flying Officer in 234 Squadron of the Royal Air Force during part of World War II.
 He was known as Russell.
 Volunteering to join the Royal Air Force Volunteer Reserve shortly after his 18th birthday he undertook pilot training in the USA, after which he became a pilot instructor in the USA and Canada.
 He later asked to be posted to an operational squadron and was posted to RAF 234 Squadron, joining them in autumn 1943, where he acquired the nickname "Ben" after the American TV and radio personality Ben Lyon.
 Russell undertook a variety of missions with the Squadron, flying from various airfields in the UK.
 At the time of D-Day the Squadron was based at RAF Deanland.
 Soon afterwards 234 Squadron was moved to RAF Predannack, on the Lizard Peninsula, where they flew further missions over northern and western France.
 At 19.00hrs on the evening of Thursday 27 July 1944 Russell piloted Supermarine Spitfire MkVb AR343, flying with seven other Spitfires, on a mission over Lorient in southern Brittany.
 At about 19.54 hrs.
 his Spitfire was hit by flak at 6000 ft. over the Lorient area and was seen to crash in flames near Ploemeur.
In computer science, a simulation is a computation of the execution of some appropriately modelled state-transition system.
 Typically this process models the complete state of the system at individual points in a discrete linear time frame, computing each state sequentially from its predecessor.
 Models for computer programs or VLSI logic designs can be very easily simulated, as they often have an operational semantics which can be used directly for simulation.
Royal Air Force Langham or more simply RAF Langham is a former Royal Air Force station, located 27.2 mi North-West of Norwich, Norfolk, England, from 1940 to 1961.
 The airfield was the most northerly of the Norfolk wartime RAF airfields and its position, being just 3.3 mi from the North sea at Blakeney.
 made it a desirable location to be used by Coastal Command which had come into prominence since the outbreak of the Second World War.
 Originally the base was built as a dispersal and satellite station to RAF Bircham Newton during the first few months of the war and it became operational in the summer of 1940.
Several motivations underlie the project.
 The primary ambition of MOM is to preserve an image of our era, created by numerous participants all over the planet.
 MOM will also contain information which our society is obliged to forward to the future: e.g. description of nuclear waste repositories.
 MOM collaborates with the NEA and SKB.
 Although the most obvious ambition and often described in the media is the concern about preserving our knowledge, this is not the primary goal of MOM.
 Serving as a time capsule MOM is both: in a time frame of millennia it is the story about us, and in a time frame of decades it is a backup.
 In times where global warming, nuclear danger and biological warfare threaten the existence of civilization, saving the core knowledge and culture acquired over centuries is a backup measure.
 In case of a collapse, the MOM project could help survivors to rebuild civilization.
 Linked to this, an another reason is of political order: facing the lack of reactivity of authorities concerning global warming, the MOM project is a reminder of what can happen.
 Roman and Greek civilizations whose histories have been reconstructed by the small percentage of texts and artifacts which survived until our days are examples that have inspired the MOM project.
 Finally, it's a critic of our digital civilization : according to Kunze, maybe nothing of the 21st century will last in the future, since most of our interactions are now virtual.
 The "accuracy versus bullshit" is one of the main themes of the MOM project, worried about loss of information, the project can only aim to save a fragment of the information produced until today, but this fragment has to be representative.
RAF Coastal Command was a formation within the Royal Air Force (RAF).
 Founded in 1936, it became the RAF's only maritime arm when the Fleet Air Arm was transferred to the Royal Navy in 1937.
 Naval aviation had been neglected in the inter-war period, due to the RAF having control of the aircraft flying from Royal Navy carriers.
 As a consequence Coastal Command did not receive the resources it needed to develop properly or efficiently.
 This continued until the outbreak of the Second World War, during which it came to prominence.
 But owing to the Air Ministry's concentration on RAF Fighter Command and RAF Bomber Command, Coastal Command was often referred to as the "Cinderella Service", a phrase first used by the First Lord of the Admiralty at the time A V Alexander.
A rapid reaction force is a military or police unit designed to respond in very short time frames to emergencies.
 When used in reference to police forces such as SWAT teams, the time frame is minutes, while in military applications, such as with the use of paratroops or other commandos, the time frame is hours to days.
No. 234 Squadron RAF had a long career within the RAF, being operational on flying boats in World War I and on fighter aircraft in World War II.
 After the war it remained a fighter unit till 1957.
 In its last incarnation the squadron was in turn Operational Training Unit (OTU), Tactical Weapon Unit (TWU) and part of No. 4 Flying Training School RAF until lastly disbanded in 1994.
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier.
 It involved the vast majority of the world's countries—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis.
 It was the most widespread war in history, and directly involved more than 100 million people from over 30 countries.
 In a state of total war, the major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, erasing the distinction between civilian and military resources.

Question: RAF Skellingthorpe was operational during the war that lasted during what time frame?
Answer: 1939 to 1945