Riot police souvenirs were on display at Hong Kong’s National Security Education Day on April 15, 2021. The event was the first held since the introduction of Hong Kong’s national security law (NSL) in June 2020. Apart from activities promoting national security education at hundreds of schools and universities, Hong Kong’s five disciplined services: the Police, Fire Services, Correctional Services, Customs and Excise, as well as the Immigration Department, held open days at their training grounds.