The T-72 is a Soviet-designed main battle tank that entered production in 1971. It replaced the T-54/55 series as the workhorse of Soviet tank forces. T-72M1 (Ob'yekt 172M-E5, Ob'yekt 172M-E6): Soviet export version, with thicker armour and similar to T-72A obr.1979g. It also is fitted with 7+5 smoke grenade dischargers on turret front, built also in Poland and ex-Czechoslovakia.