Trade fairs in the United Kingdom

thumb | right | alt=An Oshkosh Joint Light Tactical Vehicle painted in Olive green. | An Oshkosh Joint Light Tactical Vehicle painted in Olive green. Defence and Security Equipment International (DSEI, formerly stylized DSEi) is a biennial defence and security trade exhibition which serves as a forum between governments, national armed forces, industry, and academics, held at ExCeL London.