The Bomber Command Memorial on the north-western edge of Green Park, London was unveiled in 2012 by The Queen. This powerful monument is made of Portland stone and was designed by architect Liam O'Connor. The 9 foot bronze figures inside are by Philip Jackson. Another poignant feature is the ceiling of the monument, which is made out of aluminium from a Canadian Air Force Halifax that crashed in May 1944 in Belgium. The memorial commemorates the 55,573 airmen who lost their lives during bombing missions from 1939 to 1945 and is maintained by the Royal Airforce Benevolent Fund.