Kubiliūnas continued his military education: he completed the Higher Officers' Courses in Kaunas in 1925, attended the War College in Prague in 1927, and took courses in Paris in 1929. From August 1927 to July 1934, Kubiliūnas served as an officer of the Lithuanian General Staff. In February 1929, he took the position of the Chief of the Lithuanian General Staff and was promoted to Lieutenant General in November.
Kubiliūnas furthered his military studies: he finished the Higher Officers' Courses in Kaunas in 1925, attended the War College in Prague in 1927, and took courses in Paris in 1929. From August 1927 to July 1934, Kubiliūnas served as an officer of the Lithuanian General Staff. In February 1929, he assumed the position of the Chief of the Lithuanian General Staff and was elevated to Lieutenant General in November.