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I don’t know why anyone would down vote this. It does answer OP’s question. Now whether you would enjoy serving living in a tin can with 200-5k of your closest coworkers is an entirely different question.

So, this really depends on where in the US you are going to speak Spanish. It’s going to vary based on the community’s make up. A place with higher Porto Rican people is going to have a different Spanish than a Guatemalan community or a Peruvian one.

So try and do a Latin American Spanish focused class and be prepared to be wrong when you actually talk with folks.