A novel set in a fictional World War 3 taking place sometime in the 80s, first published in 1982.
This is a mess of a book that jumps between multiple points of view making the full title "Chieftains: The Bestselling Documentary Novel of a World War 3 Tank Commander" rather misleading, as it does not just stay with a British armored unit of Chieftain main battle tanks. The beginning and end of the novel does focus on the crew of one tank in the British 4th Armoured Division, but along the way we also follow a Lt. Colonel commanding the Battle Group that tank is in, an American tank, and a "stay behind" unit of British Scimitar light tanks and SAS troops. Only two of those get a conclusive ending to their story, despite jumping between all of them throughout the book.
We also get several pointless flashbacks to various events in the past that have little or no bearing on the current events of the book.
The author makes some very basic mistakes of military nomenclature in the parts featuring the US Army tank crew. He repeatedly refers to their tank as an "XM-1 Abrams" instead of an "M-1 Abrams", and also refers to "XM-723" APCs at one point. He seems unaware that the "X" stands for experimental and, as far as I know, has only been applied to vehicles under development.
The XM-723 was one of the prototype vehicles that eventually became the M2 Bradley IFV. The author is presumably including it as a speculative addition to the US arsenal. The error here being that if it had been added, it would have been as the M-723, not XM-723. Even stranger is his insistence on calling the M1 an XM1. The M1 was presumably already in service when he was writing the book (it went into service in 1980), so he must have just been referencing old articles from when it was still in development.
If you are looking for stories set in the World War 3 that everyone in the 80s feared, then find Team Yankee. It's a better book. If you've read Team Yankee and are looking for something more like it, well there's not a lot out there, and this book is probably better than nothing.