My experience with DFAS Form W-2s (see below) is that they are not available for import to the TurboTax program. You will have to manually enter the information.
If you had a DFAS Form W-2 last year and used TurboTax, the header information (Names, addresses, EIN etc.) should transfer from 2015 to 2016, but all the income and tax entries have to get entered manually.
(Experience comes from doing many personal tax returns, using TurboTax, for members of the military over the last 15 years)