#HistoricalFact T-72 Tank On August 7, 1973, by a joint resolution of the Central Committee of the Communist Party and the Council of Ministers of the USSR, the T-72 tank was adopted into service with the Soviet Army. Its weight is approximately 41–44 tonnes , depending on the version. The engine in the basic variant develops 780 horsepower . The vehicle is equipped with a 125 mm gun , with a firing range of more than 9 km .