Comparing: IS-2 vs. O-Ni

Built in 1944, the IS-2 (IS-122) heavy tank was a modification of the IS-1. It featured a simple cast glacis plate. Elite Soviet Guards heavy tank regiments used the IS-2 extensively in the assaults on the fortress cities of Budapest, Breslau, and Berlin. These vehicles featured thick white stripes for quick identification by other Soviet tank crews. This vehicle, a tank of the 7th Guards Independent Heavy Tank Brigade, was made famous in a photo taken in front of the iconic Brandenburg Gate in the heart of Berlin.

A further development of the O-I with improved anti-tank guns. The military command's plan was to improve the earlier models and achieve a higher level of armor protection on the vehicle. Existed only in blueprints. No finished prototypes were built and the vehicle never saw action.