Military attaché
In 1958–64 Kuebart served as a pilot and squadron commander at the Jagdbombergeschwader 33 in Büchel. Promoted a "Hauptmann" he received his General Staff Training at the Führungsakademie der Bundeswehr in 1964–66. In 1968–72 Kuebart commanded the Jagdbombergeschwader 34 "Allgäu" and was promoted to an "Oberst". In 1972–74 he served as a department director at the Luftflottenkommando in Cologne and in 1977 he became the German Military attaché in Madrid and in 1979, by then a "Brigadegeneral", in London.