 He qualified for the modern pentathlon at the 2016 Summer Olympics by finishing seventh at the 2015 European Championships held in Bath.Choong was placed fourth after the first three events but dropped out of the top eight during the first laps of the combined run and shooting event before moving back up during the final lap.In March 2016 at the Union Internationale de Pentathlon Moderne (UIPM) world cup event in Rio, which served as a test event for the Olympics, Choong was the highest placed British athlete, finishing thirteenth.