Defense and Security Equipment International, one of the world's largest arms fair, opened its doors at London's Excel Center on September 10. /VCG Photo

The trade show will see more than 1,600 exhibitors from 70 countries at the center for a three-day sales negotiations, keynote speeches and hardware demonstrations. Dealers can find all kinds of cutting-edge military weapons, ranging from body armors to helicopters at the event. /VCG Photo

The biennial event, which is supported by the UK's Ministry of Defense and is a key part of the country's arms export strategy, is marking its 20th anniversary with its biggest event yet this year. /VCG Photo

However, the controversial event has been criticized for glorifying war and granting military and political benefits to countries committing severe human rights violations. Some senior politicians, human rights activists as well as anti-war campaigners have been protesting outside the center. /VCG Photo