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> Or, you could have a central, federally run organization that takes responsibility for delivering sealed ballots to the respective states in a timely manner. Which is what we call voting by mail.

No, postal voting is not the same as bringing ballot boxes to voters in exceptional circumstances and does not have the same set of tradeoffs. Postal voting in particular certainly does not solve the voter manipulation problem.

The fact that so many other countries manage to actually provide ballot boxes to all voters, even to voters in much more remote scenarios than US military service and countries with far fewer resources means that the US has no excuses.