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If you are a US citizen traveling to Vietnam you can obtain a visa by any of the following 3 methods:
The easiest for you would be to apply for a 1 month multiple entry visa at the Embassy in DC using any of the below methods.
You can apply in person if you can go all the way to DC. It's a walk-in process and no appointments are needed. Otherwise, you can apply by mail or by email; the processing time is 3 business days and you will get the visa via mail.