I joined Indiana National Guard December 16. but didn't have my first drill until January. Do I check member of Armed Forces or not?

[SabrinaD2]

You are generally considered a member of the Armed Forces from the date you enlisted - December 16. Therefore, you should check "member of Armed Forces" on your tax forms.

For more detailed information, you can refer to the IRS guidelines in Publication 3, Armed Forces' Tax Guide and the IRS Military page.