You can google this:
military service irs income tax filing
And find resources you will study to learn from. Examples:
https://www.irs.gov/individuals/military
https://www.irs.gov/newsroom/tax-filing-tips-for-military-service-members-and-veterans
https://www.irs.gov/site-index-search?search=military&field_pup_historical_1=1&field_pup_historical=...
Then, you do the same thing but put their State of residence in the search, such as:
military service MA income tax filing
And make sure to read for Resident, Nonresident, and someone stationed overseas. Learn all the scenarios that apply.
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