Leutnant Johann Straub (6 June 1912 - 12 July 1996) is proud of his achievement and shows it off via the kill rings on his Geschütz (assault gun). He distinguished himself during the battle against the heavy Soviet offensive in the summer of 1944 and was awarded the Ritterkreuz (Knight's Cross) in 12 August 1944. He is the Zugführer (platoon leader) of 2.Kompanie (called Stu.Gesch.Abt.1007) / Panzerjäger-Abteilung 7 (7th Anti-Tank Battalion) / 7.Infanterie-Division. This photo was taken in that summer, between Pinsk and the River Bug

Source :
Magazine "Achtung Panzer" No.5, Sturmgeschütz III, StuG.IV & SIG.33