The Defence Act of 1925 with its extensive downsizing of units and personnel, left its mark on Jung's generation of officers and instilled in many paralysis of action. In this situation, Jung deservedly took the lead for those who did not want to give up the fight for a modern defence with a broad base and adapted to society's resources. During his service in the War History Department, he gathered around him a group of younger talented army officers for a debate on defence issues and eventually founded "Ny militär tidskrift" ("New Military Journal") in 1927, whose editor he was 1927–1930. The circle of soldiers around this came to be called "Jungjuntan" ("Jung's junta") and it consisted of Axel Rappe, Carl August Ehrensvärd, Per Sylvan, Henry Peyron, Gustaf Petri, Axel Gyllenkrook, Gunnar Berggren with Jung as editor and unifying force. Jung was also behind the publication "Antingen – eller" ("Either – Or") (1930). Through the work of the 1930 Defence Commission, he had a decisive influence on the Defence Act of 1936 and it came to consist of a ten-year rearmament plan.