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The 15cm sIG33 (Sfl) auf Jagdpanzer 38(t) Hetzer was a modified version of the standard Hetzer anti-tank vehicle that carried a 15cm heavy howitzer. Earlier in the Second World War the Germans had produced a limited number of self-propelled artillery guns based on the standard Panzer 38(t) - the 15cm sIG33 (Sfl) auf PzKpfw 38(t) Grille. By 1944 production of the Panzer 38(t) ausf M chassis and with it the Grille had come to an end and BMM were focusing on the Hetzer.
This was a good tank hunter which had a similar layout to the StuG, with sloped armour and a 7.5cm gun carried within the superstructure. Late in 1944 the Germans decided to produce a self propelled artillery gun based on the same design. This involved heightening the fuselage to make space for the sIG33 15cm heavy howitzer, but otherwise closely resembled the Hetzer. Only thirty were produced between December 1944 and February 1945, 24 from new and six by rebuilding existing Hetzers.