During the 1970s, Royal Ordnance Leeds, a British company that was later taken over by Vickers, developed an upgraded version of the FV4201 Chieftain main battle tank for export to Iran and Jordan. This tank became known as the Shir 1.
The Shir 1 had the hull of a late-model Chieftain and a new engine and
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FV4030/4 Challenger 1 Main Battle Tank
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