Dan Fuller was a soldier in the British Army after graduating from school and belongs to the 1st Royal Tank Regiment , for which he also competes as an athlete. He made his international debut at the start of the IBU Cup of the 2009/10 season in Idre and finished 156th and 127th in two sprint races. After that, it was not until 2011 that Fuller came to further missions. He achieved his best results so far in 2013 at races in Otepää , where he was 79th in an individual and 81st in a sprint. The first international championships were the 2013 European Championships in Bansko , where Fuller was 63rd of the individual and qualified as 57th of the sprint for the pursuit race, which he did not contest. He made four mistakes in both races. He could not take part in the relay race because it was canceled after various weather-related changes in the schedule of the European Championships.
Nationally, Fuller won the 2011 British Championships with the team of his regiment at the side of Stephen Hodson, Dave Scott and Paul Birmingham in the relay race, the runner-up title, in the team standings he was third with them. In 2013 he was runner-up in the team classification with Paul Birmingham, Darran Bradley and Stephen Hodson, and third in the military patrol with Rob Hollis, Henno Van-Vreden and Darran Bradley .