Despite his Swedish-speaking family background, Finnish language immersion was total in his youth, and he ultimately had to learn Swedish at school. Hägglund went to Svenska normallyceum i Helsingfors and was then educated not only at the Cadet School in Finland, but also attended the United States Army Command and General Staff College in Leavenworth, Kansas. He is also a fellow of Harvard University.
Despite his Swedish-speaking family background, Finnish language immersion was complete in his youth, and he eventually had to learn Swedish at school. Hägglund attended Svenska normalskolan i Helsingfors normally and was also educated at the Cadet School in Finland as well as the United States Army Command and General Staff College in Leavenworth, Kansas. He is also a fellow of Harvard University.