He has had a distinguished military career supported by military education in the US, Finland and the UK Royal College of Defence Studies completing the post-graduate-level courses in international strategic studies. As the first Director of the NATO Cooperative Cyber Defence Centre of Excellence, he established this institution. It was followed by service as the Chief of Staff of the Headquarters of the Estonian Defence League. Since 2018 BG Tamm is contributing to Professional Military Education of Estonia, Latvia, Lithuania and partner nations initially as the Course Director of the JCGSC and from 2020 as the Commandant of the Baltic Defence College.