I worked 3+ months in the Marshall Islands where I paid taxes to the Marshall islands and not to my home state. Federal tax remained the same. Can TurboTax handle this?

[DS30]

Yes - You will  enter the income that you earned in the Marshall Islands under the foreign earned income section.

To enter this transaction in TurboTax, log into your tax return (for TurboTax Online sign-in, click Here and click on "Take me to my return") type "foreign earned income" in the search bar then select "jump to foreign earned income". TurboTax will guide you in entering this information.

You would be able to take a Foreign Tax Credit for taxes paid in the Marshall Islands on income that is also taxed in the US. This would be a federal tax credit and will not affect the taxes that you pay in your home state.