This paper model is a Hippo Team Sturmgeschütz III (StuG III) Ausf. F tank, based on the manga / anime series Girls und Panzer, the paper toy was created by Rahamu. The Sturmgeschütz III is a German assault gun with a formidable 7.5 cm StuK 40 L/43 gun. It doesn't have a turret which make it's gun have limited rotation. It's low silhouette will makes it an ideal for ambush and urban warfare. There is another papercraft version here: Girls und Panzer – German Sturmgeschütz III Ausf. F Tank Free Paper Model.
You can download this papercraft model here: Girls und Panzer - Hippo Team Sturmgeschütz III Ausf. F Tank Paper Model Free Download