T-72
The T-72 is a Soviet-designed main battle tank that entered production in 1970. It is a further development of the T-62 with some features of the T-64A (to which it was a parallel design) and has been further developed as the T-90. Chronologically, and in design terms, it belongs to the same generation of tanks as the US M60 series, German Leopard 1, and British Chieftain tank.

T-72 Ajeya

Ajeya MK1 - Indian version of the T-72M. In parallel with buying various T-72 versions from the Soviet Union, India also launched production at a domestic heavy engineering plant in Avadi where 900 vehicles were made and designated as Ajeya, in 1993 they were improved to T-72M1 versions.

Ajeya MK2 - Indian version of the T-72M1. For a rather long time the Indian Army did not intend to modernize it's T-72 tanks since it was relying on their own tank project the Arjun. However, the Arjun program had been undergoing difficulties. As a result they adopted the Operation Rhino plan aimed at re-equipping 1,500 T-72M1 tanks. The upgrade program provides for installation of a Polish SKO-1T DRAWA-T fire control systems/thermal imagers supplied by the Polish PCO/Cenzin (from PT-91 Twardy), DRDO explosive reactive armour, a navigation system from Israel 's Tamam, German Litef or South African RDI, a locally developed laser illumination warning system, new radios manufactured by Tadiran or GES Marconi and an improved NBC protection system will be fitted. The tank is planned to be powered by a 1,000 hp (750 kW) S-1000 engine made by the Polish firm PZL-Wola (also from PT-91 Twardy). It is also upgraded with new fire detection and suppression systems and laser warning systems on either side of the turret. Also known as Combat Improved Ajeya. Indian sources often say that 1800-2,000 T-72M1 tanks will be upgraded top to bottom while the rest will undergo only partial improvement.

Tank EX - Indian integration of the Arjun turret onto the T-72 hull, Prototype only.