Regårdh had a distinguished senior career in the Swedish Army, starting as an engineer and progressing through various roles of increasing responsibility and rank.
Noteworthy positions included serving as an assistant military attaché in Washington, D.C., where he facilitated technology transfers to Sweden.
He eventually became Chief of the Swedish Army Electrical and Mechanical Engineers' Corps, overseeing significant advancements in maintenance systems and advocating for technical education reform.
[4] After that, he pursued studies at KTH Royal Institute of Technology in Stockholm, where he obtained a Master of Science degree in mechanical engineering in 1948.
[6] He later joined the Royal Swedish Army Materiel Administration's Ordnance Department, where he was assigned to the Fire Control Section of the First Weapons Office (Första vapenbyrån), starting on 1 October 1953.
[5] From 1 October 1956, to 30 September 1962, Regårdh served in Washington, D.C. as the assistant military attaché at the Swedish embassy, a position held by army engineers.
[4] The chief held the title of arméöverdirektör with the rank of colonel, and was also the head of the Royal Swedish Army Ordnance Administration's Workshop Department.
He proposed that it should be co-located with the Svea Engineer Regiment in Almnäs, Södertälje Municipality, but despite his vigorous protests, the government decided to locate the school in Östersund.