Oberstabsgefreiter

 (abbreviated OStGefr, on lists OSG) is the highest enlisted rank in the German Bundeswehr, that can be comparable to corporal in Anglophone armed forces.
History.
The rank was first introduced by the Kriegsmarine in 1940 and was named Matrosenoberstabsgefreiter. In Heer and Luftwaffe, the rank did not exist.
Bundeswehr.
A private of the German Bundeswehr might be promoted to that OR4-rank after a regular service time of 48 months.