The Battlefield series of games have been around for a really long time, having started in 2002. The games have covered various eras of warfare, starting from 1942 and then presenting some wars from the past and even from the future! Battlefield 6 will be the latest game in the series and there’s huge speculation that this will feature the Vietnam War (once again).

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@Battlefield Rental servers, commander option, more maps, more vehicles, weapons, Russian army and dlc vietnam with 6 maps = a real BF. Taking bf2 and bf3 in your day with variety and fun,
— Frank chamizo (@Cesc08Frank) October 17, 2019
Battlefield 6 Details: Modern Military or Vietnam War?
We say once again because Battlefield has featured the Vietnam war once in the past. However, back when the Vietnam War edition of the game released, it was only an expansion pack to Battlefield Bad Company 2. However, this time around, when Battlefield 6 comes out, the entire game would be focused on the Vietnam war and everything from the graphics to the costumes to the weapons would be focused on that.

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However, this is still based on speculation. There’s a good chance that the game might go ahead and release a modern-day edition where the focus will be on newer elements of warfare, including new strategies, weapons and more! Interestingly, there were plans to release a Battlefield for mobile this year but it looks like the plans might have been canned.
I dunno if it's too soon or not BUT for the next @Battlefield I'd love to see a Vietnam setting ( or modern boots on the ground ). Would also love to see the war stories continue but be a bit longer like 2hrs a war story and give us like 6 of them. Focus heavily on multiplayer!
— Austin (@GrandLotus96) April 15, 2019
Battlefield 6 Release Date and Gameplay Details

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Starting right from 2002, there hasn’t been any year till 2018 when a version of the game has not been launched. If not for a completely new game, there would at least be one expansion pack that would come out year after year. 2019 is the first time in the history of the franchise that Battlefield has decided to take a break. The game is now expected to release in late-2020, around the same time PlayStation 5 releases.