During the Second World War more than 116,000 men and women of the Air Forces of the British Commonwealth gave their lives in service. More than 17,000 of these were members of the Royal Canadian Air Force, or Canadians serving with the Royal Air Force. Approximately one-third of all who died have no known grave. Of these, 20,450 are commemorated by name on the Runnymede Memorial, which is situated at Englefield Green, near Egham, 32 kilometres by road west of London. The design of the Runnymede Memorial is original and striking. On the crest of Cooper's Hill, overlooking the Thames, a square tower dominates a cloister, in the centre of which rests the Stone of Remembrance. The cloistered walks terminate in two lookouts, one facing towards Windsor, and the other towards London Airport at Heathrow. The names of the dead are inscribed on the stone reveals of the narrow windows in the cloisters and the lookouts. They include those of 3,050 Canadian airmen. Above the three-arched entrance to the cloister is a great stone eagle with the Royal Air Force motto, Per Ardua ad Astra". On each side is the inscription: IN THIS CLOISTER ARE RECORDED THE NAMES OF TWENTY THOUSAND AIRMEN WHO HAVE NO KNOWN GRAVE. THEY DIED FOR FREEDOM IN RAID AND SORTIE OVER THE BRITISH ISLES AND THE LANDS AND SEAS OF NORTHERN AND WESTERN EUROPE In the tower a vaulted shrine, which provides a quiet place for contemplation, contains illuminated verses by Paul H. Scott."