[1] He belonged to an officer course, which, due to the increasingly threatening world political situation, had a dramatic shortening of their education in order to join units and strengthen the Swedish preparedness.

In 1959 Ljung attended the Swedish National Defence College and in 1960 he was appointed head of the Organization Department of the Army Staff.

[4] Ljung was appointed head of the Army Materiel Administration (Armématerielförvaltningen, FMV-A) at the Defence Materiel Administration in 1968, a position he held for one year before being appointed military commander of the Eastern Military District (Milo Ö) and Commandant General in Stockholm.

Ljung held this post until 1974 when he retired from the military and was appointed Director General of the Defence Materiel Administration.

[5] Ljung was a member of the board of the County Council's Fund for Technology Procurement and Product Development (Landstingets fond för teknikupphandling och produktutveckling) from 1982.