- 1966 ~ limited service (Iran–Iraq War, Gulf War 1991)
- British (export to others)
- Chieftain Mk.5 - final production variant, with upgrades to the engine and NBC protection system.
- Chieftain Mk.5P- Iranian version. (P standing for Persia 波斯), used by Iran during the Iran–Iraq War (1980–88).
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