The Royal Air Force: The rear gunner in his position in a Wellington bomber.
The road to Guillemont viewed from Waterlot Farm, 1916. In the words of the official history it was 'straight, desolate, and swept by fire.'
The remains of the village of Beaumont Hamel after its capture, The Battle of Ancre Heights 10 -11 November. 1916
The Gunboat HMS KILDANGAN in dazzle camouflage, 1918.
The dawn sky is lit by the bombardment before the assault on Thiepval, 15 September 1916, during the Battle of the Somme.
Squadron Leader Robert Stanford Tuck, commanding No. 257 Squadron, in the cockpit of his Hawker Hurricane at Martelsham Heath, November 1940.
Soldiers of 'A' Company, 11th Battalion, the Cheshire Regiment, occupy a captured German trench at Ovillers-la-Boisselle on the Somme.
Officers of 1/7th Battalion, King's Liverpool Regiment checking a map in trenches of the La Bassee Canal sector, 28 February 1918.
Munition workers in a shell warehouse at National Shell Filling Factory No.6, Chilwell, Nottinghamshire in 1917.
Men of the East Yorkshire Regiment crossing newly won ground at Frezenburg in 1917 during the Third Battle of Ypres.
Irish Guards wearing gasmasks advance through smoke with 'tommy guns' at the ready, at Nooks Head near Woking in Surrey, 8 July 1940.
Infantry from 103rd (Tyneside Irish) Brigade, 34th Division, advancing to attack La Boisselle on the morning of 1 July 1916, the opening day of the Battle of the Somme.
Horse team of the Royal Field Artillery pulling an 18 pounder field gun near Moeuvres, 27 September 1918.
HMS HERMES about to berth at Portsmouth Harbour on her return from the Falkland Islands, 21 July 1982.
HMS CONQUEROR at Faslane on 3 July 1982 after her deployment to the South Atlantic during which she sank the Argentine cruiser GENERAL BELGRANO on 2 May 1982.
MEETING OF THE SUPREME COMMAND, ALLIED EXPEDITIONARY FORCE, LONDON, 1 FEBRUARY 1944
Flying Officer Neville Duke of No 92 (East India) Squadron with his Spitfire at RAF Biggin Hill, 1941. After the war, Neville Duke became one of Britain's leading test pilots and broke the World Air Speed Record in 1953
Field Marshal Jan Smuts, Prime Minister of the Union of South Africa, standing in front of a Lockheed Lodestar aircraft of No. 234 Squadron SAAF.
Eileen Dunne, aged three, sits in bed with her doll at Great Ormond Street Hospital for Sick Children, after being injured during an air raid on London in September 1940.
Camp Bastion, Afghanistan, 2014.
British troops of the 17th Battalion, London Regiment, 47th Division, crossing a muddy area in the Ancre Valley, Somme, October 1916.
British troops advance to the attack through a cloud of poison gas as viewed from the trench which they have just left.
British paratroops inside a Dakota transport aircraft on their way to Holland during 1st Airborne Division's operation to Arnhem, 17 September 1944.
Avro Lancaster Mk I of No. 83 Squadron, based at Scampton in Lincolnshire, June 1942.
