What is "dsei"

Defence Security and Equipment International (DSEI) is a defence and security equipment exhibition held every two years in London Docklands, which draws thousands of visitors, both trade and military. It is an important event in the international military and national security equipment sales calendar and is organised in association with UK Trade & Investment's Defence & Security Organisation (UKTI DSO). It is the world’s largest fully integrated international defence exhibition featuring land, sea and air products and technologies.