Make sure that the Combat Zone is entered in the Special Processing entry of the Taxpayer Information section near the top of the Main Information Sheet. Anytime that Form W-2 has a code Q in Box 12, this field should be completed.
Some of the valid combat zones are listed on the Main Info form. If the relevant combat zone is not listed, you can use Combat Zone or Combat Zone YYYYMMDD (where YYYYMMDD is the date of deployment). You cannot put anything in this field that is not listed as an option, and it must be entered exactly as shown.