Yes, if you are currently working on your return you can go back and edit your Veteran status. To edit your Veteran status, please complete these steps
below:
Sign in to TurboTax (if you're not
already signed in).
Click on
the Take me to my return button (if you're in TurboTax Online)
Click My Info tab (left panel) then, Edit next to the your name.
Scroll down to I am a member or former member of the U.S. Armed Forces (active, reserve or National Guard), Click Yes or No and click the Continue button for it to re-populate. (See image below).