Two Chinese soldiers wearing gas masks at Pihu Military Training Centre in south eastern China.
Two cooks of the First Aid Nursing Yeomanry (FANY) outside their hut with trays of food at a military hospital at Calais in January 1917.
Two gunners in Short Sunderland Mark I, N9027, of No 210 Squadron RAF based at Oban, Argyll, sit at their positions with .303 Vickers K-type machine guns, mounted in the upper fuselage hatches.
Two Hawker Hurricanes at the Duxford Airfield during sunrise
Two Irish Guardsmen going up a communication trench with supplies. Elverdinghe, 30 July 1917.
Two members of the Auxiliary Territorial Service (ATS) check the accuracy of anti-aircraft fire from a gun battery during the Second World War.
Two men cutting templates in the mould loft.
Two men of the 12th East Yorkshires wearing snow suits leaving their snow-covered trench on daylight patrol. Arleux Sector, 9 January 1918.
Two women munition workers operate a shell case forming machine during the First World War at the New Gun Factory of the Royal Arsenal, Woolwich, London.
Two women munitions workers with a truck load of shell cases in the New Case Shop at the Royal Arsenal, Woolwich during the First World War.
Two Wren cooks carve ham for the lunchtime meal in the galley of a Fleet Air Arm base in Scotland, 1943.
Two yellow Aero Super Batics Wingwalker in display at the summer airshow
United Nations peacekeeping, governmental elections and post-war reconstruction in Liberia, 2003 - 2006, photographed by Tim Hetherington
United States Army Air Forces (USAAF) in Britain, 1942-1945
United: the United Nations Fight for Freedom
Universal carriers and lorries crossing the bridge at Nijmegen in Holland during Operation 'Market Garden', 21 September 1944.
Untitled [War Savings are Warships]
Unveiling of the permanent Cenotaph at Whitehall, by His Majesty King George V, 11 November 1920.
Use Spades Not Ships
VE DAY Celebrations in London, 8 May 1945
VE Day in London, 8 May 1945