Polish PT-91 tanks roll through the training area during Exercise Anakonda 16 at the Nowa Dęba training area, Poland.

The PT-91 Twardy is a Polish main battle tank. It is a development of the Soviet-designed T-72M1 and first entered service in 1995. The PT-91 was designed at the OBRUM (OBRUM for Ośrodek Badawczo-Rozwojowy Urządzeń Mechanicznych – Polish for Research and Development Centre for Mechanical Appliances) and is produced by the Bumar Łabędy company – part of Polish military consortium – Bumar Group. Changes from the T-72 include a new dual-axis stabilized fire-control system, reactive armour, a more powerful engine, transmission and new automatic loader.