Obgfr appears to be an abbreviation for the German rank "Obergefreiter" which is equivalent to a Corporal.

The cast of Der Keller - 1957 includes: Rudolf Fleck as Wuttke, Unteroffizier Walter Kainz as Balk, SS-Mann Gerhard Lau as Wieland, Obergefreiter

The cast of Kongo - 2010 includes: Jodi Balfour as Johanna Wenz Cal de Beer as Dietmar Wellinghoff Pope Jerrod as Captain Crocodile Florence Kasumba as Sprachmittlerin Noelle Sikhanyiso Mdlalose as Patrice Mbongeni Nomkonwana as Eugene Matthew Patrick Mozart Balwin as Obergefreiter Franz David Rott as Feldwebel Marco Bogner Maria Simon as Oberleutnant Nicole Ziegler Peggy Tunyiswa as Eleni Hannes Wegener as Obergefreiter Philip Althaus

The cast of D III 38 - 1939 includes: Hans Bernuth as Flieger Paul Bildt as Stabsarzt der Flugstaffel Horst Birr as Monteur Hasinger Hermann Braun as Obergefreiter Robert Eckhard Erich Dunskus as Bauer Fritz Eberth as Funker Lindner Heinz Engelmann as Lt. Frank Adolf Fischer as Gefreiter Zeissler Walter Gross as Funker Josef Kamper as Bauernknecht Hilde Land as Kantinenwirtin Guenther Markert as Marineoffizier Karl Martell as Lt. Ludwig Becker Paul Otto as General Ferry Reich as 2. Funker Wolfgang Staudte as Marineoffizier Eduard von Winterstein as Landarzt Heinz Welzel as Obergefreiter Fritz Paulsen Otto Wernicke as Oberwerkmeister Bonicke

The cast of Endkampf - 1966 includes: Dora Altmann as Oma Gustl Bayrhammer as Bauer Stocker Siegurd Fitzek as Leutnant Urban Al Hoosmann as Amerikanischer Soldat Ernst Ronnecker as Unteroffizier Moll Kurt Sowinetz as Feldwebel Zauner Herbert Stass as Obergefreiter Laschensky Fritz Strassner as Kreisleiter Holger Ungerer as Soldat Brechtel