You must file in Guam. Your military pay is not taxable by GA.
Per page 4 of IRS Publication 570, military servicemembers who were bona fide residents of Guam prior to entering service remain Guam residents regardless of where they are stationed.
https://www.irs.gov/pub/irs-pdf/p570.pdf
You need to file your taxes on a Guam 1040. As @SteamTrain said, the 2024 forms have not yet been published.
https://www.guamtax.com/forms/2023Form1040.pdf
According to this website, military pay is taxable in Guam:
https://myarmybenefits.us.army.mil/Benefit-Library/State/Territory-Benefits/Guam#:~:text=Guam%20Taxe....
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
