In the "My Info" section be sure you answer all the questions concerning military service including rank. Enlisted members are eligible for the the "Free File." Be sure to enter your military W2 information in the "Income" section and select "Active Duty Military Pay" in the follow on questions for the W2. When you go through the filing interview at the end you will see your TurboTax bill and the discount will be applied. Here is a link with information.
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