Complex sentence: I, II, III and IV. This would be combined with the abbreviated Geschwader designation-for example, the second Gruppe of Jagdgeschwader 11 would be designated as II./JG 11.
Split into simpler sentences: I, II, III and IV. This would be followed with the Geschwader Abbreviation. For Example, second Group of Jagdgeschwader 11 would be designated as II./JG 11.