For a commercial vessel, if you want to carry cargo from one US port to another.  See <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Merchant_Marine_Act_of_1920" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Merchant_Marine_Act_of_1920</a> though that also requires the vessel to be US-built&#x2F;owned&#x2F;crewed...