It can depend at times on the business.
Also check your service regulation on whether you need permission similar to rules on moonlighting.
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Mr. Cave is correct. It depends on several factors. For example, a JAG officer cannot practice law on the side, but might be allowed to sell t-shirts. Check with your command and service regulations.
This post is for information purposes only and does not constitute legal advice, nor does it establish an attorney client relationship with Mr. Cassara.