The ISU-152 is a Soviet self-propelled gun developed and used during World War II. It was unofficially nicknamed zveroboy (Russian: Зверобой; "beast killer") in response to several large German tanks and guns coming into service, including Tigers and Panthers. Since the ISU-152's gun was mounted in a casemate, aiming it was awkward, and had to be done by repositioning the entire vehicle using the tracks. Therefore, it was used as mobile artillery to support more mobile infantry and armor attacks. It continued service into the 1970s and was used in several campaigns and countries.