Every two years, the UK hosts the world's largest arms fair - the four-day Defence and Security Equipment International (DSEI) show. The latest one was in September.
It is mainly to promote the British arms industry. But attendees include manufacturers from around the world, who come to make mammoth deals.
We sent British journalist Joe Mellor to see what's on offer and who's buying.
Read Al Jazeera America's recent report on the global arms trade: http://bit.ly/1PeTe3A
Source: Al Jazeera