The Chieftain, is a 2nd Generation MBT of the British Army, coming out from the failed FV4202 project, it was the successor of the Centurion, the first MBT

This specific variant, is the Chieftain Mk.6, which was an upgrade from older models.

It served with the British, Kuwaiti, Iranian, and other armies, with the Iranian one still in service today with modifications