NACI background check

I intend to work in Antarctica.

One of the requirements is passing a NACI. From my understanding only DoD NACI investigate credit history.

Is this accurate information?

It is the only thing that I could get dinged on.

How Do I Get NACI Clearance? - Career Trend

http://www.dami.army.pentagon.mil/site/PerSec/InvTypes.aspx

You can get dinged on anything that your employer considers unsuitable for the position and location you are applying.