If you are active duty military and have an enlisted rank, there is no charge to use the TurboTax online editions (but Not the Live editions or the Full Service Editions). You must have a military W-2 to be entered on the tax return to be eligible for the no charge option.
Go to this TurboTax website for active duty military - https://turbotax.intuit.com/personal-taxes/online/military-edition.jsp