Magnusson served in several military assignments in the 1930s, including the Air Force Headquarters.

During the Winter War, Magnusson, newly promoted to the rank of major, flew several combat flights with the squadron, achieving four victories.

In the beginning of the Continuation War, on 10 November 1941, Magnusson was promoted to lieutenant colonel, and at the same time he was barred from flying combat missions.

24 Squadron until May 1943, when he was appointed command of Flight Regiment 3, a position he held until the end of the Continuation War.

[1] By recommendation of the Air Force Commander, JF Lundqvist, he was given the Mannerheim Cross on 23 June 1944 (Number 129).