The tour is 4 years long, you can get the job you want and when the time come for the end, you can retire and be an actor… USN rules.

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If you can try summer stock. If you are good someone may offer you a bit part in the theater, But actors are dime a dozen

I don’t think they really care if someday you want to be an actor. However, if you enlist as a shore patrol, you won’t be able to switch within the navy to be an actor. You would have to leave the Navy first.